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set optimizer_switch='semijoin=on,materialization=on,firstmatch=on,loosescan=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=off'; set @old_opt_switch=@@optimizer_switch; set optimizer_switch='subquery_materialization_cost_based=off'; drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t11,t12; select (select 2); (select 2) 2 explain extended select (select 2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1249 Select 2 was reduced during optimization Note 1003 /* select#1 */ select 2 AS `(select 2)` SELECT (SELECT 1) UNION SELECT (SELECT 2); (SELECT 1) 1 2 explain extended SELECT (SELECT 1) UNION SELECT (SELECT 2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 3 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used NULL UNION RESULT <union1,3> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1249 Select 2 was reduced during optimization Note 1249 Select 4 was reduced during optimization Note 1003 /* select#1 */ select 1 AS `(SELECT 1)` union /* select#3 */ select 2 AS `(SELECT 2)` SELECT (SELECT (SELECT 0 UNION SELECT 0)); (SELECT (SELECT 0 UNION SELECT 0)) 0 explain extended SELECT (SELECT (SELECT 0 UNION SELECT 0)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 4 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1249 Select 2 was reduced during optimization Note 1003 /* select#1 */ select (/* select#3 */ select 0 union /* select#4 */ select 0) AS `(SELECT (SELECT 0 UNION SELECT 0))` SELECT (SELECT 1 FROM (SELECT 1) as b HAVING a=1) as a; ERROR 42S22: Reference 'a' not supported (forward reference in item list) SELECT (SELECT 1 FROM (SELECT 1) as b HAVING b=1) as a,(SELECT 1 FROM (SELECT 1) as c HAVING a=1) as b; ERROR 42S22: Reference 'b' not supported (forward reference in item list) SELECT (SELECT 1),MAX(1) FROM (SELECT 1) as a; (SELECT 1) MAX(1) 1 1 SELECT (SELECT a) as a; ERROR 42S22: Reference 'a' not supported (forward reference in item list) EXPLAIN EXTENDED SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 100.00 NULL 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1 Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1 Note 1003 /* select#1 */ select 1 AS `1` from dual having ((/* select#3 */ select '1') = 1) SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1; 1 1 SELECT (SELECT 1), a; ERROR 42S22: Unknown column 'a' in 'field list' SELECT 1 as a FROM (SELECT 1) as b HAVING (SELECT a)=1; a 1 SELECT 1 FROM (SELECT (SELECT a) b) c; ERROR 42S22: Unknown column 'a' in 'field list' SELECT * FROM (SELECT 1 as id) b WHERE id IN (SELECT * FROM (SELECT 1 as id) c ORDER BY id); id 1 SELECT * FROM (SELECT 1) a WHERE 1 IN (SELECT 1,1); ERROR 21000: Operand should contain 1 column(s) SELECT 1 IN (SELECT 1); 1 IN (SELECT 1) 1 SELECT 1 FROM (SELECT 1 as a) b WHERE 1 IN (SELECT (SELECT a)); 1 1 select (SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE(1)); ERROR HY000: Incorrect usage of PROCEDURE and subquery SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE((SELECT 1)); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(SELECT 1))' at line 1 SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NULL; ERROR 42S22: Unknown column 'a' in 'field list' SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NOT NULL; ERROR 42S22: Unknown column 'a' in 'field list' SELECT (SELECT 1,2,3) = ROW(1,2,3); (SELECT 1,2,3) = ROW(1,2,3) 1 SELECT (SELECT 1,2,3) = ROW(1,2,1); (SELECT 1,2,3) = ROW(1,2,1) 0 SELECT (SELECT 1,2,3) < ROW(1,2,1); (SELECT 1,2,3) < ROW(1,2,1) 0 SELECT (SELECT 1,2,3) > ROW(1,2,1); (SELECT 1,2,3) > ROW(1,2,1) 1 SELECT (SELECT 1,2,3) = ROW(1,2,NULL); (SELECT 1,2,3) = ROW(1,2,NULL) NULL SELECT ROW(1,2,3) = (SELECT 1,2,3); ROW(1,2,3) = (SELECT 1,2,3) 1 SELECT ROW(1,2,3) = (SELECT 1,2,1); ROW(1,2,3) = (SELECT 1,2,1) 0 SELECT ROW(1,2,3) < (SELECT 1,2,1); ROW(1,2,3) < (SELECT 1,2,1) 0 SELECT ROW(1,2,3) > (SELECT 1,2,1); ROW(1,2,3) > (SELECT 1,2,1) 1 SELECT ROW(1,2,3) = (SELECT 1,2,NULL); ROW(1,2,3) = (SELECT 1,2,NULL) NULL SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'a'); (SELECT 1.5,2,'a') = ROW(1.5,2,'a') 1 SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'b'); (SELECT 1.5,2,'a') = ROW(1.5,2,'b') 0 SELECT (SELECT 1.5,2,'a') = ROW('1.5b',2,'b'); (SELECT 1.5,2,'a') = ROW('1.5b',2,'b') 0 Warnings: Warning 1292 Truncated incorrect DOUBLE value: '1.5b' SELECT (SELECT 'b',2,'a') = ROW(1.5,2,'a'); (SELECT 'b',2,'a') = ROW(1.5,2,'a') 0 SELECT (SELECT 1.5,2,'a') = ROW(1.5,'2','a'); (SELECT 1.5,2,'a') = ROW(1.5,'2','a') 1 SELECT (SELECT 1.5,'c','a') = ROW(1.5,2,'a'); (SELECT 1.5,'c','a') = ROW(1.5,2,'a') 0 SELECT (SELECT * FROM (SELECT 'test' a,'test' b) a); ERROR 21000: Operand should contain 1 column(s) SELECT 1 as a,(SELECT a+a) b,(SELECT b); a b (SELECT b) 1 2 2 create table t1 (a int); create table t2 (a int, b int); create table t3 (a int); create table t4 (a int not null, b int not null); insert into t1 values (2); insert into t2 values (1,7),(2,7); insert into t4 values (4,8),(3,8),(5,9); select (select a from t1 where t1.a = a1) as a2, (select b from t2 where t2.b=a2) as a1; ERROR 42S22: Reference 'a1' not supported (forward reference in item list) select (select a from t1 where t1.a=t2.a), a from t2; (select a from t1 where t1.a=t2.a) a NULL 1 2 2 select (select a from t1 where t1.a=t2.b), a from t2; (select a from t1 where t1.a=t2.b) a NULL 1 NULL 2 select (select a from t1), a, (select 1 union select 2 limit 1) from t2; (select a from t1) a (select 1 union select 2 limit 1) 2 1 1 2 2 1 select (select a from t3), a from t2; (select a from t3) a NULL 1 NULL 2 select * from t2 where t2.a=(select a from t1); a b 2 7 insert into t3 values (6),(7),(3); select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1); a b 1 7 2 7 (select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 order by a limit 2) limit 3; a b 1 7 2 7 3 8 (select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a); a b 1 7 2 7 4 8 3 8 explain extended (select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where 2 SUBQUERY t3 ALL NULL NULL NULL NULL 3 100.00 Using filesort 3 UNION t4 ALL NULL NULL NULL NULL 3 100.00 Using where 4 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 NULL NULL UNION RESULT <union1,3> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1003 (/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`b` = (/* select#2 */ select `test`.`t3`.`a` from `test`.`t3` order by 1 desc limit 1))) union (/* select#3 */ select `test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t4` where (`test`.`t4`.`b` = (/* select#4 */ select (max(`test`.`t2`.`a`) * 4) from `test`.`t2`)) order by `a`) select (select a from t3 where a<t2.a*4 order by 1 desc limit 1), a from t2; (select a from t3 where a<t2.a*4 order by 1 desc limit 1) a 3 1 7 2 select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from (select * from t2 where a>1) as tt; (select t3.a from t3 where a<8 order by 1 desc limit 1) a 7 2 explain extended select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from (select * from t2 where a>1) as tt; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived3> ALL NULL NULL NULL NULL 2 100.00 NULL 3 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using where 2 SUBQUERY t3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using filesort Warnings: Note 1003 /* select#1 */ select (/* select#2 */ select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,`tt`.`a` AS `a` from (/* select#3 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`a` > 1)) `tt` select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1); a 2 select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a > t1.a) order by 1 desc limit 1); a 2 select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a < t1.a) order by 1 desc limit 1); a select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4; b (select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) 8 7.5000 8 4.5000 9 7.5000 explain extended select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t4 ALL NULL NULL NULL NULL 3 100.00 NULL 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 NULL 3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1276 Field or reference 'test.t4.a' of SELECT #3 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t4`.`b` AS `b`,(/* select#2 */ select avg((`test`.`t2`.`a` + (/* select#3 */ select min(`test`.`t3`.`a`) from `test`.`t3` where (`test`.`t3`.`a` >= `test`.`t4`.`a`)))) from `test`.`t2`) AS `(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2)` from `test`.`t4` select * from t3 where exists (select * from t2 where t2.b=t3.a); a 7 select * from t3 where not exists (select * from t2 where t2.b=t3.a); a 6 3 select * from t3 where a in (select b from t2); a 7 select * from t3 where a not in (select b from t2); a 6 3 select * from t3 where a = some (select b from t2); a 7 select * from t3 where a <> any (select b from t2); a 6 3 select * from t3 where a = all (select b from t2); a 7 select * from t3 where a <> all (select b from t2); a 6 3 insert into t2 values (100, 5); select * from t3 where a < any (select b from t2); a 6 3 select * from t3 where a < all (select b from t2); a 3 select * from t3 where a >= any (select b from t2); a 6 7 explain extended select * from t3 where a >= any (select b from t2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>((`test`.`t3`.`a` >= (/* select#2 */ select min(`test`.`t2`.`b`) from `test`.`t2`))) select * from t3 where a >= all (select b from t2); a 7 delete from t2 where a=100; select * from t3 where a in (select a,b from t2); ERROR 21000: Operand should contain 1 column(s) select * from t3 where a in (select * from t2); ERROR 21000: Operand should contain 1 column(s) insert into t4 values (12,7),(1,7),(10,9),(9,6),(7,6),(3,9),(1,10); select b,max(a) as ma from t4 group by b having b < (select max(t2.a) from t2 where t2.b=t4.b); b ma insert into t2 values (2,10); select b,max(a) as ma from t4 group by b having ma < (select max(t2.a) from t2 where t2.b=t4.b); b ma 10 1 delete from t2 where a=2 and b=10; select b,max(a) as ma from t4 group by b having b >= (select max(t2.a) from t2 where t2.b=t4.b); b ma 7 12 create table t5 (a int); select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2; (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a NULL 1 2 2 insert into t5 values (5); select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2; (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a NULL 1 2 2 insert into t5 values (2); select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2; (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a NULL 1 2 2 explain extended select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 NULL 2 DEPENDENT SUBQUERY t1 system NULL NULL NULL NULL 1 100.00 NULL 3 DEPENDENT UNION t5 ALL NULL NULL NULL NULL 2 100.00 Using where NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1276 Field or reference 'test.t2.a' of SELECT #2 was resolved in SELECT #1 Note 1276 Field or reference 'test.t2.a' of SELECT #3 was resolved in SELECT #1 Note 1003 /* select#1 */ select (/* select#2 */ select '2' from dual where ('2' = `test`.`t2`.`a`) union /* select#3 */ select `test`.`t5`.`a` from `test`.`t5` where (`test`.`t5`.`a` = `test`.`t2`.`a`)) AS `(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a)`,`test`.`t2`.`a` AS `a` from `test`.`t2` select (select a from t1 where t1.a=t2.a union all select a from t5 where t5.a=t2.a), a from t2; ERROR 21000: Subquery returns more than 1 row create table t6 (patient_uq int, clinic_uq int, index i1 (clinic_uq)); create table t7( uq int primary key, name char(25)); insert into t7 values(1,"Oblastnaia bolnitsa"),(2,"Bolnitsa Krasnogo Kresta"); insert into t6 values (1,1),(1,2),(2,2),(1,3); select * from t6 where exists (select * from t7 where uq = clinic_uq); patient_uq clinic_uq 1 1 1 2 2 2 explain extended select * from t6 where exists (select * from t7 where uq = clinic_uq); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t6 ALL NULL NULL NULL NULL 4 100.00 Using where 2 DEPENDENT SUBQUERY t7 eq_ref PRIMARY PRIMARY 4 test.t6.clinic_uq 1 100.00 Using index Warnings: Note 1276 Field or reference 'test.t6.clinic_uq' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t6`.`patient_uq` AS `patient_uq`,`test`.`t6`.`clinic_uq` AS `clinic_uq` from `test`.`t6` where exists(/* select#2 */ select 1 from `test`.`t7` where (`test`.`t7`.`uq` = `test`.`t6`.`clinic_uq`)) select * from t1 where a= (select a from t2,t4 where t2.b=t4.b); ERROR 23000: Column 'a' in field list is ambiguous drop table t1,t2,t3; CREATE TABLE t3 (a varchar(20),b char(1) NOT NULL default '0'); INSERT INTO t3 VALUES ('W','a'),('A','c'),('J','b'); CREATE TABLE t2 (a varchar(20),b int NOT NULL default '0'); INSERT INTO t2 VALUES ('W','1'),('A','3'),('J','2'); CREATE TABLE t1 (a varchar(20),b date NOT NULL default '0000-00-00'); INSERT INTO t1 VALUES ('W','1732-02-22'),('A','1735-10-30'),('J','1743-04-13'); SELECT * FROM t1 WHERE b = (SELECT MIN(b) FROM t1); a b W 1732-02-22 SELECT * FROM t2 WHERE b = (SELECT MIN(b) FROM t2); a b W 1 SELECT * FROM t3 WHERE b = (SELECT MIN(b) FROM t3); a b W a CREATE TABLE `t8` ( `pseudo` varchar(35) character set latin1 NOT NULL default '', `email` varchar(60) character set latin1 NOT NULL default '', PRIMARY KEY (`pseudo`), UNIQUE KEY `email` (`email`) ) ENGINE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC; INSERT INTO t8 (pseudo,email) VALUES ('joce','test'); INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1'); INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1'); EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index 4 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index 2 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 NULL 3 SUBQUERY t8 const PRIMARY PRIMARY 37 const 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select 'joce' AS `pseudo`,(/* select#2 */ select 'test' from `test`.`t8` where 1) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where 1 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM t8 WHERE pseudo='joce'); ERROR 21000: Operand should contain 1 column(s) SELECT pseudo FROM t8 WHERE pseudo=(SELECT * FROM t8 WHERE pseudo='joce'); ERROR 21000: Operand should contain 1 column(s) SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'); pseudo joce SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo LIKE '%joce%'); ERROR 21000: Subquery returns more than 1 row drop table if exists t1,t2,t3,t4,t5,t6,t7,t8; CREATE TABLE `t1` ( `topic` mediumint(8) unsigned NOT NULL default '0', `date` date NOT NULL default '0000-00-00', `pseudo` varchar(35) character set latin1 NOT NULL default '', PRIMARY KEY (`pseudo`,`date`,`topic`), KEY `topic` (`topic`) ) ENGINE=MyISAM ROW_FORMAT=DYNAMIC; INSERT INTO t1 (topic,date,pseudo) VALUES ('43506','2002-10-02','joce'),('40143','2002-08-03','joce'); EXPLAIN EXTENDED SELECT DISTINCT date FROM t1 WHERE date='2002-08-03'; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 index PRIMARY PRIMARY 43 NULL 2 100.00 Using where; Using index Warnings: Note 1003 /* select#1 */ select distinct `test`.`t1`.`date` AS `date` from `test`.`t1` where (`test`.`t1`.`date` = '2002-08-03') EXPLAIN EXTENDED SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 2 SUBQUERY t1 index PRIMARY PRIMARY 43 NULL 2 100.00 Using where; Using index Warnings: Note 1003 /* select#1 */ select (/* select#2 */ select distinct `test`.`t1`.`date` from `test`.`t1` where (`test`.`t1`.`date` = '2002-08-03')) AS `(SELECT DISTINCT date FROM t1 WHERE date='2002-08-03')` SELECT DISTINCT date FROM t1 WHERE date='2002-08-03'; date 2002-08-03 SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03'); (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03') 2002-08-03 SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1) UNION ALL SELECT 1; 1 1 1 1 SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1) UNION SELECT 1; ERROR 21000: Subquery returns more than 1 row EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL topic 3 NULL 2 100.00 Using index 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 3 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where 1 drop table t1; CREATE TABLE `t1` ( `numeropost` mediumint(8) unsigned NOT NULL auto_increment, `maxnumrep` int(10) unsigned NOT NULL default '0', PRIMARY KEY (`numeropost`), UNIQUE KEY `maxnumrep` (`maxnumrep`) ) ENGINE=MyISAM ROW_FORMAT=FIXED; INSERT INTO t1 (numeropost,maxnumrep) VALUES (40143,1),(43506,2); CREATE TABLE `t2` ( `mot` varchar(30) NOT NULL default '', `topic` mediumint(8) unsigned NOT NULL default '0', `date` date NOT NULL default '0000-00-00', `pseudo` varchar(35) NOT NULL default '', PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`) ) ENGINE=MyISAM ROW_FORMAT=DYNAMIC; INSERT INTO t2 (mot,topic,date,pseudo) VALUES ('joce','40143','2002-10-22','joce'), ('joce','43506','2002-10-22','joce'); select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1); a 40143 SELECT numeropost,maxnumrep FROM t1 WHERE exists (SELECT 1 FROM t2 WHERE (mot='joce') AND date >= '2002-10-21' AND t1.numeropost = t2.topic) ORDER BY maxnumrep DESC LIMIT 0, 20; numeropost maxnumrep 43506 2 40143 1 SELECT (SELECT 1) as a FROM (SELECT 1 FROM t1 HAVING a=1) b; ERROR 42S22: Unknown column 'a' in 'having clause' SELECT 1 IN (SELECT 1 FROM t2 HAVING a); ERROR 42S22: Unknown column 'a' in 'having clause' SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic); mot topic date pseudo joce 40143 2002-10-22 joce joce 43506 2002-10-22 joce SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100); mot topic date pseudo SELECT * from t2 where topic IN (SELECT SUM(topic) FROM t1); mot topic date pseudo SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic); mot topic date pseudo joce 40143 2002-10-22 joce joce 43506 2002-10-22 joce SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100); mot topic date pseudo SELECT * from t2 where topic = any (SELECT SUM(topic) FROM t1); mot topic date pseudo SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic); mot topic date pseudo SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100); mot topic date pseudo joce 40143 2002-10-22 joce joce 43506 2002-10-22 joce SELECT *, topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100) from t2; mot topic date pseudo topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100) joce 40143 2002-10-22 joce 1 joce 43506 2002-10-22 joce 1 SELECT * from t2 where topic = all (SELECT SUM(topic) FROM t2); mot topic date pseudo SELECT * from t2 where topic <> any (SELECT SUM(topic) FROM t2); mot topic date pseudo joce 40143 2002-10-22 joce joce 43506 2002-10-22 joce SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000); mot topic date pseudo joce 40143 2002-10-22 joce SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000); mot topic date pseudo joce 40143 2002-10-22 joce SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000); mot topic date pseudo joce 40143 2002-10-22 joce SELECT *, topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000) from t2; mot topic date pseudo topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000) joce 40143 2002-10-22 joce 1 joce 43506 2002-10-22 joce 0 drop table t1,t2; CREATE TABLE `t1` ( `numeropost` mediumint(8) unsigned NOT NULL auto_increment, `maxnumrep` int(10) unsigned NOT NULL default '0', PRIMARY KEY (`numeropost`), UNIQUE KEY `maxnumrep` (`maxnumrep`) ) ENGINE=MyISAM ROW_FORMAT=FIXED; INSERT INTO t1 (numeropost,maxnumrep) VALUES (1,0),(2,1); select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1); ERROR 21000: Subquery returns more than 1 row select numeropost as a FROM t1 ORDER BY (SELECT 1 FROM t1 HAVING a=1); ERROR 21000: Subquery returns more than 1 row drop table t1; create table t1 (a int); insert into t1 values (1),(2),(3); (select * from t1) union (select * from t1) order by (select a from t1 limit 1); a 1 2 3 drop table t1; CREATE TABLE t1 (field char(1) NOT NULL DEFAULT 'b'); INSERT INTO t1 VALUES (); SELECT field FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1 FROM (SELECT 1) a HAVING field='b'); ERROR 21000: Subquery returns more than 1 row drop table t1; CREATE TABLE `t1` ( `numeropost` mediumint(8) unsigned NOT NULL default '0', `numreponse` int(10) unsigned NOT NULL auto_increment, `pseudo` varchar(35) NOT NULL default '', PRIMARY KEY (`numeropost`,`numreponse`), UNIQUE KEY `numreponse` (`numreponse`), KEY `pseudo` (`pseudo`,`numeropost`) ) ENGINE=MyISAM; SELECT (SELECT numeropost FROM t1 HAVING numreponse=a),numreponse FROM (SELECT * FROM t1) as a; ERROR 42S22: Reference 'numreponse' not supported (forward reference in item list) SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=a) FROM (SELECT * FROM t1) as a; ERROR 42S22: Unknown column 'a' in 'having clause' SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT * FROM t1) as a; numreponse (SELECT numeropost FROM t1 HAVING numreponse=1) INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test'); EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1'); ERROR 21000: Subquery returns more than 1 row EXPLAIN EXTENDED SELECT MAX(numreponse) FROM t1 WHERE numeropost='1'; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Select tables optimized away Warnings: Note 1003 /* select#1 */ select max(`test`.`t1`.`numreponse`) AS `MAX(numreponse)` from `test`.`t1` where (`test`.`t1`.`numeropost` = '1') EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT MAX(numreponse) FROM t1 WHERE numeropost='1'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 const PRIMARY,numreponse PRIMARY 7 const,const 1 100.00 Using index 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Select tables optimized away Warnings: Note 1003 /* select#1 */ select '3' AS `numreponse` from `test`.`t1` where (('1' = '1')) drop table t1; CREATE TABLE t1 (a int(1)); INSERT INTO t1 VALUES (1); SELECT 1 FROM (SELECT a FROM t1) b HAVING (SELECT b.a)=1; 1 1 drop table t1; create table t1 (a int NOT NULL, b int, primary key (a)); create table t2 (a int NOT NULL, b int, primary key (a)); insert into t1 values (0, 10),(1, 11),(2, 12); insert into t2 values (1, 21),(2, 22),(3, 23); select * from t1; a b 0 10 1 11 2 12 update t1 set b= (select b from t1); ERROR HY000: You can't specify target table 't1' for update in FROM clause update t1 set b= (select b from t2); ERROR 21000: Subquery returns more than 1 row update t1 set b= (select b from t2 where t1.a = t2.a); select * from t1; a b 0 NULL 1 21 2 22 drop table t1, t2; create table t1 (a int NOT NULL, b int, primary key (a)); create table t2 (a int NOT NULL, b int, primary key (a)); insert into t1 values (0, 10),(1, 11),(2, 12); insert into t2 values (1, 21),(2, 12),(3, 23); select * from t1; a b 0 10 1 11 2 12 select * from t1 where b = (select b from t2 where t1.a = t2.a); a b 2 12 delete from t1 where b = (select b from t1); ERROR HY000: You can't specify target table 't1' for update in FROM clause delete from t1 where b = (select b from t2); ERROR 21000: Subquery returns more than 1 row delete from t1 where b = (select b from t2 where t1.a = t2.a); select * from t1; a b 0 10 1 11 drop table t1, t2; create table t11 (a int NOT NULL, b int, primary key (a)); create table t12 (a int NOT NULL, b int, primary key (a)); create table t2 (a int NOT NULL, b int, primary key (a)); insert into t11 values (0, 10),(1, 11),(2, 12); insert into t12 values (33, 10),(22, 11),(2, 12); insert into t2 values (1, 21),(2, 12),(3, 23); select * from t11; a b 0 10 1 11 2 12 select * from t12; a b 33 10 22 11 2 12 delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t12 where t11.a = t12.a); ERROR HY000: You can't specify target table 't12' for update in FROM clause delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t2); ERROR 21000: Subquery returns more than 1 row delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t2 where t11.a = t2.a); select * from t11; a b 0 10 1 11 select * from t12; a b 33 10 22 11 drop table t11, t12, t2; CREATE TABLE t1 (x int); create table t2 (a int); create table t3 (b int); insert into t2 values (1); insert into t3 values (1),(2); INSERT INTO t1 (x) VALUES ((SELECT x FROM t1)); ERROR HY000: You can't specify target table 't1' for update in FROM clause INSERT INTO t1 (x) VALUES ((SELECT b FROM t3)); ERROR 21000: Subquery returns more than 1 row INSERT INTO t1 (x) VALUES ((SELECT a FROM t2)); select * from t1; x 1 insert into t2 values (1); INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2)); Warnings: Warning 1287 'INSERT DELAYED' is deprecated and will be removed in a future release. Please use INSERT instead select * from t1; x 1 2 INSERT INTO t1 (x) select (SELECT SUM(a)+1 FROM t2) FROM t2; select * from t1; x 1 2 3 3 INSERT INTO t1 (x) select (SELECT SUM(x)+2 FROM t1) FROM t2; select * from t1; x 1 2 3 3 11 11 INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(x) FROM t2)); ERROR 42S22: Unknown column 'x' in 'field list' INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2)); Warnings: Warning 1287 'INSERT DELAYED' is deprecated and will be removed in a future release. Please use INSERT instead select * from t1; x 1 2 3 3 11 11 2 drop table t1, t2, t3; CREATE TABLE t1 (x int not null, y int, primary key (x)); create table t2 (a int); create table t3 (a int); insert into t2 values (1); insert into t3 values (1),(2); select * from t1; x y replace into t1 (x, y) VALUES ((SELECT x FROM t1), (SELECT a+1 FROM t2)); ERROR HY000: You can't specify target table 't1' for update in FROM clause replace into t1 (x, y) VALUES ((SELECT a FROM t3), (SELECT a+1 FROM t2)); ERROR 21000: Subquery returns more than 1 row replace into t1 (x, y) VALUES ((SELECT a FROM t2), (SELECT a+1 FROM t2)); select * from t1; x y 1 2 replace into t1 (x, y) VALUES ((SELECT a FROM t2), (SELECT a+2 FROM t2)); select * from t1; x y 1 3 replace DELAYED into t1 (x, y) VALUES ((SELECT a+3 FROM t2), (SELECT a FROM t2)); Warnings: Warning 1287 'REPLACE DELAYED' is deprecated and will be removed in a future release. Please use REPLACE instead select * from t1; x y 1 3 4 1 replace DELAYED into t1 (x, y) VALUES ((SELECT a+3 FROM t2), (SELECT a+1 FROM t2)); Warnings: Warning 1287 'REPLACE DELAYED' is deprecated and will be removed in a future release. Please use REPLACE instead select * from t1; x y 1 3 4 2 replace LOW_PRIORITY into t1 (x, y) VALUES ((SELECT a+1 FROM t2), (SELECT a FROM t2)); select * from t1; x y 1 3 4 2 2 1 drop table t1, t2, t3; SELECT * FROM (SELECT 1) b WHERE 1 IN (SELECT *); ERROR HY000: No tables used CREATE TABLE t2 (id int(11) default NULL, KEY id (id)) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t2 VALUES (1),(2); SELECT * FROM t2 WHERE id IN (SELECT 1); id 1 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 ref id id 5 const 1 100.00 Using index Warnings: Note 1249 Select 2 was reduced during optimization Note 1003 /* select#1 */ select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = 1) SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3); id 1 SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1)); id 2 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 ref id id 5 const 1 100.00 Using index Warnings: Note 1249 Select 3 was reduced during optimization Note 1249 Select 2 was reduced during optimization Note 1003 /* select#1 */ select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = (1 + 1)) EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 index NULL id 5 NULL 2 100.00 Using where; Using index 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1003 /* select#1 */ select `test`.`t2`.`id` AS `id` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`id`,<exists>(/* select#2 */ select 1 having (<cache>(`test`.`t2`.`id`) = <ref_null_helper>(1)) union /* select#3 */ select 3 having (<cache>(`test`.`t2`.`id`) = <ref_null_helper>(3)))) SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 3); id SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 2); id 2 INSERT INTO t2 VALUES ((SELECT * FROM t2)); ERROR HY000: You can't specify target table 't2' for update in FROM clause INSERT INTO t2 VALUES ((SELECT id FROM t2)); ERROR HY000: You can't specify target table 't2' for update in FROM clause SELECT * FROM t2; id 1 2 CREATE TABLE t1 (id int(11) default NULL, KEY id (id)) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t1 values (1),(1); UPDATE t2 SET id=(SELECT * FROM t1); ERROR 21000: Subquery returns more than 1 row drop table t2, t1; create table t1 (a int); insert into t1 values (1),(2),(3); select 1 IN (SELECT * from t1); 1 IN (SELECT * from t1) 1 select 10 IN (SELECT * from t1); 10 IN (SELECT * from t1) 0 select NULL IN (SELECT * from t1); NULL IN (SELECT * from t1) NULL update t1 set a=NULL where a=2; select 1 IN (SELECT * from t1); 1 IN (SELECT * from t1) 1 select 3 IN (SELECT * from t1); 3 IN (SELECT * from t1) 1 select 10 IN (SELECT * from t1); 10 IN (SELECT * from t1) NULL select 1 > ALL (SELECT * from t1); 1 > ALL (SELECT * from t1) 0 select 10 > ALL (SELECT * from t1); 10 > ALL (SELECT * from t1) NULL select 1 > ANY (SELECT * from t1); 1 > ANY (SELECT * from t1) NULL select 10 > ANY (SELECT * from t1); 10 > ANY (SELECT * from t1) 1 drop table t1; create table t1 (a varchar(20)); insert into t1 values ('A'),('BC'),('DEF'); select 'A' IN (SELECT * from t1); 'A' IN (SELECT * from t1) 1 select 'XYZS' IN (SELECT * from t1); 'XYZS' IN (SELECT * from t1) 0 select NULL IN (SELECT * from t1); NULL IN (SELECT * from t1) NULL update t1 set a=NULL where a='BC'; select 'A' IN (SELECT * from t1); 'A' IN (SELECT * from t1) 1 select 'DEF' IN (SELECT * from t1); 'DEF' IN (SELECT * from t1) 1 select 'XYZS' IN (SELECT * from t1); 'XYZS' IN (SELECT * from t1) NULL select 'A' > ALL (SELECT * from t1); 'A' > ALL (SELECT * from t1) 0 select 'XYZS' > ALL (SELECT * from t1); 'XYZS' > ALL (SELECT * from t1) NULL select 'A' > ANY (SELECT * from t1); 'A' > ANY (SELECT * from t1) NULL select 'XYZS' > ANY (SELECT * from t1); 'XYZS' > ANY (SELECT * from t1) 1 drop table t1; create table t1 (a float); insert into t1 values (1.5),(2.5),(3.5); select 1.5 IN (SELECT * from t1); 1.5 IN (SELECT * from t1) 1 select 10.5 IN (SELECT * from t1); 10.5 IN (SELECT * from t1) 0 select NULL IN (SELECT * from t1); NULL IN (SELECT * from t1) NULL update t1 set a=NULL where a=2.5; select 1.5 IN (SELECT * from t1); 1.5 IN (SELECT * from t1) 1 select 3.5 IN (SELECT * from t1); 3.5 IN (SELECT * from t1) 1 select 10.5 IN (SELECT * from t1); 10.5 IN (SELECT * from t1) NULL select 1.5 > ALL (SELECT * from t1); 1.5 > ALL (SELECT * from t1) 0 select 10.5 > ALL (SELECT * from t1); 10.5 > ALL (SELECT * from t1) NULL select 1.5 > ANY (SELECT * from t1); 1.5 > ANY (SELECT * from t1) NULL select 10.5 > ANY (SELECT * from t1); 10.5 > ANY (SELECT * from t1) 1 explain extended select (select a+1) from t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1 Note 1249 Select 2 was reduced during optimization Note 1003 /* select#1 */ select (`test`.`t1`.`a` + 1) AS `(select a+1)` from `test`.`t1` select (select a+1) from t1; (select a+1) 2.5 NULL 4.5 drop table t1; CREATE TABLE t1 (a int(11) NOT NULL default '0', PRIMARY KEY (a)); CREATE TABLE t2 (a int(11) default '0', INDEX (a)); INSERT INTO t1 VALUES (1),(2),(3),(4); INSERT INTO t2 VALUES (1),(2),(3); SELECT t1.a, t1.a in (select t2.a from t2) FROM t1; a t1.a in (select t2.a from t2) 1 1 2 1 3 1 4 0 explain extended SELECT t1.a, t1.a in (select t2.a from t2) FROM t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 100.00 Using index 2 SUBQUERY t2 index a a 5 NULL 3 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`a`))))) AS `t1.a in (select t2.a from t2)` from `test`.`t1` CREATE TABLE t3 (a int(11) default '0'); INSERT INTO t3 VALUES (1),(2),(3); SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1; a t1.a in (select t2.a from t2,t3 where t3.a=t2.a) 1 1 2 1 3 1 4 0 explain extended SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 100.00 Using index 2 SUBQUERY t3 ALL NULL NULL NULL NULL 3 100.00 NULL 2 SUBQUERY t2 index a a 5 NULL 3 100.00 Using where; Using index; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` join `test`.`t3` where (`test`.`t2`.`a` = `test`.`t3`.`a`) having 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`a`))))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1` drop table t1,t2,t3; create table t1 (a float); select 10.5 IN (SELECT * from t1 LIMIT 1); ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery' select 10.5 IN (SELECT * from t1 LIMIT 1 UNION SELECT 1.5); ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery' drop table t1; create table t1 (a int, b int, c varchar(10)); create table t2 (a int); insert into t1 values (1,2,'a'),(2,3,'b'),(3,4,'c'); insert into t2 values (1),(2),(NULL); select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),(select c from t1 where a=t2.a) from t2; a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a') (select c from t1 where a=t2.a) 1 1 a 2 0 b NULL NULL NULL select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b'),(select c from t1 where a=t2.a) from t2; a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b') (select c from t1 where a=t2.a) 1 0 a 2 1 b NULL NULL NULL select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c'),(select c from t1 where a=t2.a) from t2; a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c') (select c from t1 where a=t2.a) 1 0 a 2 0 b NULL NULL NULL drop table t1,t2; create table t1 (a int, b real, c varchar(10)); insert into t1 values (1, 1, 'a'), (2,2,'b'), (NULL, 2, 'b'); select ROW(1, 1, 'a') IN (select a,b,c from t1); ROW(1, 1, 'a') IN (select a,b,c from t1) 1 select ROW(1, 2, 'a') IN (select a,b,c from t1); ROW(1, 2, 'a') IN (select a,b,c from t1) 0 select ROW(1, 1, 'a') IN (select b,a,c from t1); ROW(1, 1, 'a') IN (select b,a,c from t1) 1 select ROW(1, 1, 'a') IN (select a,b,c from t1 where a is not null); ROW(1, 1, 'a') IN (select a,b,c from t1 where a is not null) 1 select ROW(1, 2, 'a') IN (select a,b,c from t1 where a is not null); ROW(1, 2, 'a') IN (select a,b,c from t1 where a is not null) 0 select ROW(1, 1, 'a') IN (select b,a,c from t1 where a is not null); ROW(1, 1, 'a') IN (select b,a,c from t1 where a is not null) 1 select ROW(1, 1, 'a') IN (select a,b,c from t1 where c='b' or c='a'); ROW(1, 1, 'a') IN (select a,b,c from t1 where c='b' or c='a') 1 select ROW(1, 2, 'a') IN (select a,b,c from t1 where c='b' or c='a'); ROW(1, 2, 'a') IN (select a,b,c from t1 where c='b' or c='a') 0 select ROW(1, 1, 'a') IN (select b,a,c from t1 where c='b' or c='a'); ROW(1, 1, 'a') IN (select b,a,c from t1 where c='b' or c='a') 1 select ROW(1, 1, 'a') IN (select b,a,c from t1 limit 2); ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery' drop table t1; create table t1 (a int); insert into t1 values (1); do @a:=(SELECT a from t1); select @a; @a 1 set @a:=2; set @a:=(SELECT a from t1); select @a; @a 1 drop table t1; do (SELECT a from t1); ERROR 42S02: Table 'test.t1' doesn't exist set @a:=(SELECT a from t1); ERROR 42S02: Table 'test.t1' doesn't exist CREATE TABLE t1 (a int, KEY(a)); HANDLER t1 OPEN; HANDLER t1 READ a=((SELECT 1)); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT 1))' at line 1 HANDLER t1 CLOSE; drop table t1; create table t1 (a int); create table t2 (b int); insert into t1 values (1),(2); insert into t2 values (1); select a from t1 where a in (select a from t1 where a in (select b from t2)); a 1 drop table t1, t2; create table t1 (a int, b int); create table t2 like t1; insert into t1 values (1,2),(1,3),(1,4),(1,5); insert into t2 values (1,2),(1,3); select * from t1 where row(a,b) in (select a,b from t2); a b 1 2 1 3 drop table t1, t2; CREATE TABLE `t1` (`i` int(11) NOT NULL default '0',PRIMARY KEY (`i`)) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t1 VALUES (1); UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i)); select * from t1; i 2 drop table t1; CREATE TABLE t1 (a int(1)); EXPLAIN EXTENDED SELECT (SELECT RAND() FROM t1) FROM t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 0 0.00 const row not found 2 UNCACHEABLE SUBQUERY t1 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select (/* select#2 */ select rand() from `test`.`t1`) AS `(SELECT RAND() FROM t1)` from `test`.`t1` EXPLAIN EXTENDED SELECT (SELECT ENCRYPT('test') FROM t1) FROM t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 0 0.00 const row not found 2 UNCACHEABLE SUBQUERY t1 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select (/* select#2 */ select encrypt('test') from `test`.`t1`) AS `(SELECT ENCRYPT('test') FROM t1)` from `test`.`t1` EXPLAIN EXTENDED SELECT (SELECT BENCHMARK(1,1) FROM t1) FROM t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 0 0.00 const row not found 2 UNCACHEABLE SUBQUERY t1 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select (/* select#2 */ select benchmark(1,1) from `test`.`t1`) AS `(SELECT BENCHMARK(1,1) FROM t1)` from `test`.`t1` drop table t1; CREATE TABLE `t1` ( `mot` varchar(30) character set latin1 NOT NULL default '', `topic` mediumint(8) unsigned NOT NULL default '0', `date` date NOT NULL default '0000-00-00', `pseudo` varchar(35) character set latin1 NOT NULL default '', PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`), KEY `pseudo` (`pseudo`,`date`,`topic`), KEY `topic` (`topic`) ) ENGINE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC; CREATE TABLE `t2` ( `mot` varchar(30) character set latin1 NOT NULL default '', `topic` mediumint(8) unsigned NOT NULL default '0', `date` date NOT NULL default '0000-00-00', `pseudo` varchar(35) character set latin1 NOT NULL default '', PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`), KEY `pseudo` (`pseudo`,`date`,`topic`), KEY `topic` (`topic`) ) ENGINE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC; CREATE TABLE `t3` ( `numeropost` mediumint(8) unsigned NOT NULL auto_increment, `maxnumrep` int(10) unsigned NOT NULL default '0', PRIMARY KEY (`numeropost`), UNIQUE KEY `maxnumrep` (`maxnumrep`) ) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t1 VALUES ('joce','1','','joce'),('test','2','','test'); Warnings: Warning 1265 Data truncated for column 'date' at row 1 Warning 1265 Data truncated for column 'date' at row 2 INSERT INTO t2 VALUES ('joce','1','','joce'),('test','2','','test'); Warnings: Warning 1265 Data truncated for column 'date' at row 1 Warning 1265 Data truncated for column 'date' at row 2 INSERT INTO t3 VALUES (1,1); SELECT DISTINCT topic FROM t2 WHERE NOT EXISTS(SELECT * FROM t3 WHERE numeropost=topic); topic 2 select * from t1; mot topic date pseudo joce 1 0000-00-00 joce test 2 0000-00-00 test DELETE FROM t1 WHERE topic IN (SELECT DISTINCT topic FROM t2 WHERE NOT EXISTS(SELECT * FROM t3 WHERE numeropost=topic)); select * from t1; mot topic date pseudo joce 1 0000-00-00 joce drop table t1, t2, t3; SELECT * FROM (SELECT 1 as a,(SELECT a)) a; a (SELECT a) 1 1 CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT 1)) a; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(1) NOT NULL DEFAULT '0', `(SELECT 1)` int(1) NOT NULL DEFAULT '0' ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT a)) a; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(1) NOT NULL DEFAULT '0', `(SELECT a)` int(1) NOT NULL DEFAULT '0' ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT a+0)) a; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(1) NOT NULL DEFAULT '0', `(SELECT a+0)` int(3) NOT NULL DEFAULT '0' ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; CREATE TABLE t1 SELECT (SELECT 1 as a UNION SELECT 1+1 limit 1,1) as a; select * from t1; a 2 SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` bigint(20) NOT NULL DEFAULT '0' ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; create table t1 (a int); insert into t1 values (1), (2), (3); explain extended select a,(select (select rand() from t1 limit 1) from t1 limit 1) from t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 NULL 2 UNCACHEABLE SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 NULL 3 UNCACHEABLE SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,(/* select#2 */ select (/* select#3 */ select rand() from `test`.`t1` limit 1) from `test`.`t1` limit 1) AS `(select (select rand() from t1 limit 1) from t1 limit 1)` from `test`.`t1` drop table t1; select t1.Continent, t2.Name, t2.Population from t1 LEFT JOIN t2 ON t1.Code = t2.Country where t2.Population IN (select max(t2.Population) AS Population from t2, t1 where t2.Country = t1.Code group by Continent); ERROR 42S02: Table 'test.t1' doesn't exist CREATE TABLE t1 ( ID int(11) NOT NULL auto_increment, name char(35) NOT NULL default '', t2 char(3) NOT NULL default '', District char(20) NOT NULL default '', Population int(11) NOT NULL default '0', PRIMARY KEY (ID) ) ENGINE=MyISAM; INSERT INTO t1 VALUES (130,'Sydney','AUS','New South Wales',3276207); INSERT INTO t1 VALUES (131,'Melbourne','AUS','Victoria',2865329); INSERT INTO t1 VALUES (132,'Brisbane','AUS','Queensland',1291117); CREATE TABLE t2 ( Code char(3) NOT NULL default '', Name char(52) NOT NULL default '', Continent enum('Asia','Europe','North America','Africa','Oceania','Antarctica','South America') NOT NULL default 'Asia', Region char(26) NOT NULL default '', SurfaceArea float(10,2) NOT NULL default '0.00', IndepYear smallint(6) default NULL, Population int(11) NOT NULL default '0', LifeExpectancy float(3,1) default NULL, GNP float(10,2) default NULL, GNPOld float(10,2) default NULL, LocalName char(45) NOT NULL default '', GovernmentForm char(45) NOT NULL default '', HeadOfState char(60) default NULL, Capital int(11) default NULL, Code2 char(2) NOT NULL default '', PRIMARY KEY (Code) ) ENGINE=MyISAM; INSERT INTO t2 VALUES ('AUS','Australia','Oceania','Australia and New Zealand',7741220.00,1901,18886000,79.8,351182.00,392911.00,'Australia','Constitutional Monarchy, Federation','Elisabeth II',135,'AU'); INSERT INTO t2 VALUES ('AZE','Azerbaijan','Asia','Middle East',86600.00,1991,7734000,62.9,4127.00,4100.00,'Azärbaycan','Federal Republic','Heydär Äliyev',144,'AZ'); select t2.Continent, t1.Name, t1.Population from t2 LEFT JOIN t1 ON t2.Code = t1.t2 where t1.Population IN (select max(t1.Population) AS Population from t1, t2 where t1.t2 = t2.Code group by Continent); Continent Name Population Oceania Sydney 3276207 drop table t1, t2; CREATE TABLE `t1` ( `id` mediumint(8) unsigned NOT NULL auto_increment, `pseudo` varchar(35) character set latin1 NOT NULL default '', PRIMARY KEY (`id`), UNIQUE KEY `pseudo` (`pseudo`) ) ENGINE=MyISAM PACK_KEYS=1 ROW_FORMAT=DYNAMIC; INSERT INTO t1 (pseudo) VALUES ('test'); SELECT 0 IN (SELECT 1 FROM t1 a); 0 IN (SELECT 1 FROM t1 a) 0 EXPLAIN EXTENDED SELECT 0 IN (SELECT 1 FROM t1 a); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE Warnings: Note 1003 /* select#1 */ select <in_optimizer>(0,<exists>(/* select#2 */ select 1 from `test`.`t1` `a` where 0)) AS `0 IN (SELECT 1 FROM t1 a)` INSERT INTO t1 (pseudo) VALUES ('test1'); SELECT 0 IN (SELECT 1 FROM t1 a); 0 IN (SELECT 1 FROM t1 a) 0 EXPLAIN EXTENDED SELECT 0 IN (SELECT 1 FROM t1 a); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE Warnings: Note 1003 /* select#1 */ select <in_optimizer>(0,<exists>(/* select#2 */ select 1 from `test`.`t1` `a` where 0)) AS `0 IN (SELECT 1 FROM t1 a)` drop table t1; CREATE TABLE `t1` ( `i` int(11) NOT NULL default '0', PRIMARY KEY (`i`) ) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t1 VALUES (1); UPDATE t1 SET i=i+(SELECT MAX(i) FROM (SELECT 1) t) WHERE i=(SELECT MAX(i)); UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i)); UPDATE t1 SET t.i=i+(SELECT MAX(i) FROM (SELECT 1) t); ERROR 42S22: Unknown column 't.i' in 'field list' select * from t1; i 3 drop table t1; CREATE TABLE t1 ( id int(11) default NULL ) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t1 VALUES (1),(1),(2),(2),(1),(3); CREATE TABLE t2 ( id int(11) default NULL, name varchar(15) default NULL ) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t2 VALUES (4,'vita'), (1,'vita'), (2,'vita'), (1,'vita'); update t1, t2 set t2.name='lenka' where t2.id in (select id from t1); select * from t2; id name 4 vita 1 lenka 2 lenka 1 lenka drop table t1,t2; create table t1 (a int, unique index indexa (a)); insert into t1 values (-1), (-4), (-2), (NULL); select -10 IN (select a from t1 FORCE INDEX (indexa)); -10 IN (select a from t1 FORCE INDEX (indexa)) NULL drop table t1; create table t1 (id int not null auto_increment primary key, salary int, key(salary)); insert into t1 (salary) values (100),(1000),(10000),(10),(500),(5000),(50000); explain extended SELECT id FROM t1 where salary = (SELECT MAX(salary) FROM t1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ref salary salary 5 const 1 100.00 Using where 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Select tables optimized away Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`id` AS `id` from `test`.`t1` where (`test`.`t1`.`salary` = (/* select#2 */ select max(`test`.`t1`.`salary`) from `test`.`t1`)) drop table t1; CREATE TABLE t1 ( ID int(10) unsigned NOT NULL auto_increment, SUB_ID int(3) unsigned NOT NULL default '0', REF_ID int(10) unsigned default NULL, REF_SUB int(3) unsigned default '0', PRIMARY KEY (ID,SUB_ID), UNIQUE KEY t1_PK (ID,SUB_ID), KEY t1_FK (REF_ID,REF_SUB), KEY t1_REFID (REF_ID) ) ENGINE=MyISAM CHARSET=cp1251; INSERT INTO t1 VALUES (1,0,NULL,NULL),(2,0,NULL,NULL); SELECT DISTINCT REF_ID FROM t1 WHERE ID= (SELECT DISTINCT REF_ID FROM t1 WHERE ID=2); REF_ID DROP TABLE t1; create table t1 (a int, b int); create table t2 (a int, b int); insert into t1 values (1,0), (2,0), (3,0); insert into t2 values (1,1), (2,1), (3,1), (2,2); update ignore t1 set b=(select b from t2 where t1.a=t2.a); Warnings: Error 1242 Subquery returns more than 1 row select * from t1; a b 1 1 2 NULL 3 1 drop table t1, t2; CREATE TABLE `t1` ( `id` mediumint(8) unsigned NOT NULL auto_increment, `pseudo` varchar(35) NOT NULL default '', `email` varchar(60) NOT NULL default '', PRIMARY KEY (`id`), UNIQUE KEY `email` (`email`), UNIQUE KEY `pseudo` (`pseudo`) ) ENGINE=MyISAM CHARSET=latin1 PACK_KEYS=1 ROW_FORMAT=DYNAMIC; INSERT INTO t1 (id,pseudo,email) VALUES (1,'test','test'),(2,'test1','test1'); SELECT pseudo as a, pseudo as b FROM t1 GROUP BY (SELECT a) ORDER BY (SELECT id*1); a b test test test1 test1 drop table if exists t1; (SELECT 1 as a) UNION (SELECT 1) ORDER BY (SELECT a+0); a 1 create table t1 (a int, b int); create table t2 (a int, b int); create table t3 (a int, b int); insert into t1 values (0,100),(1,2), (1,3), (2,2), (2,7), (2,-1), (3,10); insert into t2 values (0,0), (1,1), (2,1), (3,1), (4,1); insert into t3 values (3,3), (2,2), (1,1); select a,(select count(distinct t1.b) as sum from t1,t2 where t1.a=t2.a and t2.b > 0 and t1.a <= t3.b group by t1.a order by sum limit 1) from t3; a (select count(distinct t1.b) as sum from t1,t2 where t1.a=t2.a and t2.b > 0 and t1.a <= t3.b group by t1.a order by sum limit 1) 3 1 2 2 1 2 drop table t1,t2,t3; create table t1 (s1 int); create table t2 (s1 int); insert into t1 values (1); insert into t2 values (1); select * from t1 where exists (select s1 from t2 having max(t2.s1)=t1.s1); s1 1 drop table t1,t2; create table t1 (s1 int); create table t2 (s1 int); insert into t1 values (1); insert into t2 values (1); update t1 set s1 = s1 + 1 where 1 = (select x.s1 as A from t2 WHERE t2.s1 > t1.s1 order by A); ERROR 42S22: Unknown column 'x.s1' in 'field list' DROP TABLE t1, t2; CREATE TABLE t1 (s1 CHAR(5) COLLATE latin1_german1_ci, s2 CHAR(5) COLLATE latin1_swedish_ci); INSERT INTO t1 VALUES ('z','?'); select * from t1 where s1 > (select max(s2) from t1); ERROR HY000: Illegal mix of collations (latin1_german1_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation '>' select * from t1 where s1 > any (select max(s2) from t1); ERROR HY000: Illegal mix of collations (latin1_german1_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation '>' drop table t1; create table t1(toid int,rd int); create table t2(userid int,pmnew int,pmtotal int); insert into t2 values(1,0,0),(2,0,0); insert into t1 values(1,0),(1,0),(1,0),(1,12),(1,15),(1,123),(1,12312),(1,12312),(1,123),(2,0),(2,0),(2,1),(2,2); select userid,pmtotal,pmnew, (select count(rd) from t1 where toid=t2.userid) calc_total, (select count(rd) from t1 where rd=0 and toid=t2.userid) calc_new from t2 where userid in (select distinct toid from t1); userid pmtotal pmnew calc_total calc_new 1 0 0 9 3 2 0 0 4 2 drop table t1, t2; create table t1 (s1 char(5)); select (select 'a','b' from t1 union select 'a','b' from t1) from t1; ERROR 21000: Operand should contain 1 column(s) insert into t1 values ('tttt'); select * from t1 where ('a','b')=(select 'a','b' from t1 union select 'a','b' from t1); s1 tttt explain extended (select * from t1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00 NULL Warnings: Note 1003 (/* select#1 */ select 'tttt' AS `s1` from dual) (select * from t1); s1 tttt drop table t1; create table t1 (s1 char(5), index s1(s1)); create table t2 (s1 char(5), index s1(s1)); insert into t1 values ('a1'),('a2'),('a3'); insert into t2 values ('a1'),('a2'); select s1, s1 NOT IN (SELECT s1 FROM t2) from t1; s1 s1 NOT IN (SELECT s1 FROM t2) a1 0 a2 0 a3 1 select s1, s1 = ANY (SELECT s1 FROM t2) from t1; s1 s1 = ANY (SELECT s1 FROM t2) a1 1 a2 1 a3 0 select s1, s1 <> ALL (SELECT s1 FROM t2) from t1; s1 s1 <> ALL (SELECT s1 FROM t2) a1 0 a2 0 a3 1 select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1; s1 s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') a1 0 a2 1 a3 1 explain extended select s1, s1 NOT IN (SELECT s1 FROM t2) from t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index 2 SUBQUERY t2 index s1 s1 6 NULL 2 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,`test`.`t1`.`s1` in ( <materialize> (/* select#2 */ select `test`.`t2`.`s1` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`s1` in <temporary table> on <auto_key> where ((`test`.`t1`.`s1` = `materialized-subquery`.`s1`))))))) AS `s1 NOT IN (SELECT s1 FROM t2)` from `test`.`t1` explain extended select s1, s1 = ANY (SELECT s1 FROM t2) from t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index 2 SUBQUERY t2 index s1 s1 6 NULL 2 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`s1` AS `s1`,<in_optimizer>(`test`.`t1`.`s1`,`test`.`t1`.`s1` in ( <materialize> (/* select#2 */ select `test`.`t2`.`s1` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`s1` in <temporary table> on <auto_key> where ((`test`.`t1`.`s1` = `materialized-subquery`.`s1`))))) AS `s1 = ANY (SELECT s1 FROM t2)` from `test`.`t1` explain extended select s1, s1 <> ALL (SELECT s1 FROM t2) from t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index 2 SUBQUERY t2 index s1 s1 6 NULL 2 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,`test`.`t1`.`s1` in ( <materialize> (/* select#2 */ select `test`.`t2`.`s1` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`s1` in <temporary table> on <auto_key> where ((`test`.`t1`.`s1` = `materialized-subquery`.`s1`))))))) AS `s1 <> ALL (SELECT s1 FROM t2)` from `test`.`t1` explain extended select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL s1 6 NULL 3 100.00 Using index 2 SUBQUERY t2 index s1 s1 6 NULL 2 50.00 Using where; Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`s1` AS `s1`,(not(<in_optimizer>(`test`.`t1`.`s1`,`test`.`t1`.`s1` in ( <materialize> (/* select#2 */ select `test`.`t2`.`s1` from `test`.`t2` where (`test`.`t2`.`s1` < 'a2') having 1 ), <primary_index_lookup>(`test`.`t1`.`s1` in <temporary table> on <auto_key> where ((`test`.`t1`.`s1` = `materialized-subquery`.`s1`))))))) AS `s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')` from `test`.`t1` drop table t1,t2; create table t2 (a int, b int); create table t3 (a int); insert into t3 values (6),(7),(3); select * from t3 where a >= all (select b from t2); a 6 7 3 explain extended select * from t3 where a >= all (select b from t2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where <not>((`test`.`t3`.`a` < <max>(/* select#2 */ select NULL from `test`.`t2`))) select * from t3 where a >= some (select b from t2); a explain extended select * from t3 where a >= some (select b from t2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>((`test`.`t3`.`a` >= (/* select#2 */ select min(NULL) from `test`.`t2`))) select * from t3 where a >= all (select b from t2 group by 1); a 6 7 3 explain extended select * from t3 where a >= all (select b from t2 group by 1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where <not>((`test`.`t3`.`a` < <max>(/* select#2 */ select NULL from `test`.`t2`))) select * from t3 where a >= some (select b from t2 group by 1); a explain extended select * from t3 where a >= some (select b from t2 group by 1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>((`test`.`t3`.`a` >= (/* select#2 */ select min(NULL) from `test`.`t2`))) select * from t3 where NULL >= any (select b from t2); a explain extended select * from t3 where NULL >= any (select b from t2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0 select * from t3 where NULL >= any (select b from t2 group by 1); a explain extended select * from t3 where NULL >= any (select b from t2 group by 1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0 select * from t3 where NULL >= some (select b from t2); a explain extended select * from t3 where NULL >= some (select b from t2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0 select * from t3 where NULL >= some (select b from t2 group by 1); a explain extended select * from t3 where NULL >= some (select b from t2 group by 1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t2 system NULL NULL NULL NULL 0 0.00 const row not found Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0 insert into t2 values (2,2), (2,1), (3,3), (3,1); select * from t3 where a > all (select max(b) from t2 group by a); a 6 7 explain extended select * from t3 where a > all (select max(b) from t2 group by a); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 4 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where <not>((`test`.`t3`.`a` <= <max>(/* select#2 */ select max(`test`.`t2`.`b`) from `test`.`t2` group by `test`.`t2`.`a`))) drop table t2, t3; CREATE TABLE `t1` ( `id` mediumint(9) NOT NULL auto_increment, `taskid` bigint(20) NOT NULL default '0', `dbid` int(11) NOT NULL default '0', `create_date` datetime NOT NULL default '0000-00-00 00:00:00', `last_update` datetime NOT NULL default '0000-00-00 00:00:00', PRIMARY KEY (`id`)) ENGINE=MyISAM CHARSET=latin1 AUTO_INCREMENT=3 ; INSERT INTO `t1` (`id`, `taskid`, `dbid`, `create_date`,`last_update`) VALUES (1, 1, 15, '2003-09-29 10:31:36', '2003-09-29 10:31:36'), (2, 1, 21, now(), now()); CREATE TABLE `t2` (`db_id` int(11) NOT NULL auto_increment,`name` varchar(200) NOT NULL default '',`primary_uid` smallint(6) NOT NULL default '0',`secondary_uid` smallint(6) NOT NULL default '0',PRIMARY KEY (`db_id`),UNIQUE KEY `name_2` (`name`),FULLTEXT KEY `name` (`name`)) ENGINE=MyISAM CHARSET=latin1 AUTO_INCREMENT=2147483647; INSERT INTO `t2` (`db_id`, `name`, `primary_uid`, `secondary_uid`) VALUES (18, 'Not Set 1', 0, 0),(19, 'Valid', 1, 2),(20, 'Valid 2', 1, 2),(21, 'Should Not Return', 1, 2),(26, 'Not Set 2', 0, 0),(-1, 'ALL DB\'S', 0, 0); CREATE TABLE `t3` (`taskgenid` mediumint(9) NOT NULL auto_increment,`dbid` int(11) NOT NULL default '0',`taskid` int(11) NOT NULL default '0',`mon` tinyint(4) NOT NULL default '1',`tues` tinyint(4) NOT NULL default '1',`wed` tinyint(4) NOT NULL default '1',`thur` tinyint(4) NOT NULL default '1',`fri` tinyint(4) NOT NULL default '1',`sat` tinyint(4) NOT NULL default '0',`sun` tinyint(4) NOT NULL default '0',`how_often` smallint(6) NOT NULL default '1',`userid` smallint(6) NOT NULL default '0',`active` tinyint(4) NOT NULL default '1',PRIMARY KEY (`taskgenid`)) ENGINE=MyISAM CHARSET=latin1 AUTO_INCREMENT=2 ; INSERT INTO `t3` (`taskgenid`, `dbid`, `taskid`, `mon`, `tues`,`wed`, `thur`, `fri`, `sat`, `sun`, `how_often`, `userid`, `active`) VALUES (1,-1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1); CREATE TABLE `t4` (`task_id` smallint(6) NOT NULL default '0',`description` varchar(200) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1; INSERT INTO `t4` (`task_id`, `description`) VALUES (1, 'Daily Check List'),(2, 'Weekly Status'); select dbid, name, (date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01') from t3 a, t2 b, t4 WHERE dbid = - 1 AND primary_uid = '1' AND t4.task_id = taskid; dbid name (date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01') -1 Valid 1 -1 Valid 2 1 -1 Should Not Return 0 SELECT dbid, name FROM t3 a, t2 b, t4 WHERE dbid = - 1 AND primary_uid = '1' AND ((date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01')) AND t4.task_id = taskid; dbid name -1 Valid -1 Valid 2 drop table t1,t2,t3,t4; CREATE TABLE t1 (id int(11) default NULL) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t1 VALUES (1),(5); CREATE TABLE t2 (id int(11) default NULL) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t2 VALUES (2),(6); select * from t1 where (1,2,6) in (select * from t2); ERROR 21000: Operand should contain 3 column(s) DROP TABLE t1,t2; create table t1 (s1 int); insert into t1 values (1); insert into t1 values (2); set sort_buffer_size = (select s1 from t1); ERROR 21000: Subquery returns more than 1 row do (select * from t1); Warnings: Error 1242 Subquery returns more than 1 row drop table t1; create table t1 (s1 char); insert into t1 values ('e'); select * from t1 where 'f' > any (select s1 from t1); s1 e select * from t1 where 'f' > any (select s1 from t1 union select s1 from t1); s1 e explain extended select * from t1 where 'f' > any (select s1 from t1 union select s1 from t1); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00 NULL 2 SUBQUERY t1 system NULL NULL NULL NULL 1 100.00 NULL 3 UNION t1 system NULL NULL NULL NULL 1 100.00 NULL NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1003 /* select#1 */ select 'e' AS `s1` from dual where 1 drop table t1; CREATE TABLE t1 (number char(11) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1; INSERT INTO t1 VALUES ('69294728265'),('18621828126'),('89356874041'),('95895001874'); CREATE TABLE t2 (code char(5) NOT NULL default '',UNIQUE KEY code (code)) ENGINE=MyISAM CHARSET=latin1; INSERT INTO t2 VALUES ('1'),('1226'),('1245'),('1862'),('18623'),('1874'),('1967'),('6'); select c.number as phone,(select p.code from t2 p where c.number like concat(p.code, '%') order by length(p.code) desc limit 1) as code from t1 c; phone code 69294728265 6 18621828126 1862 89356874041 NULL 95895001874 NULL drop table t1, t2; create table t1 (s1 int); create table t2 (s1 int); select * from t1 where (select count(*) from t2 where t1.s2) = 1; ERROR 42S22: Unknown column 't1.s2' in 'where clause' select * from t1 where (select count(*) from t2 group by t1.s2) = 1; ERROR 42S22: Unknown column 't1.s2' in 'group statement' select count(*) from t2 group by t1.s2; ERROR 42S22: Unknown column 't1.s2' in 'group statement' drop table t1, t2; CREATE TABLE t1(COLA FLOAT NOT NULL,COLB FLOAT NOT NULL,COLC VARCHAR(20) DEFAULT NULL,PRIMARY KEY (COLA, COLB)); CREATE TABLE t2(COLA FLOAT NOT NULL,COLB FLOAT NOT NULL,COLC CHAR(1) NOT NULL,PRIMARY KEY (COLA)); INSERT INTO t1 VALUES (1,1,'1A3240'), (1,2,'4W2365'); INSERT INTO t2 VALUES (100, 200, 'C'); SELECT DISTINCT COLC FROM t1 WHERE COLA = (SELECT COLA FROM t2 WHERE COLB = 200 AND COLC ='C' LIMIT 1); COLC DROP TABLE t1, t2; CREATE TABLE t1 (a int(1)); INSERT INTO t1 VALUES (1),(1),(1),(1),(1),(2),(3),(4),(5); SELECT DISTINCT (SELECT a) FROM t1 LIMIT 100; (SELECT a) 1 2 3 4 5 DROP TABLE t1; create table t1 (a int, b decimal(13, 3)); insert into t1 values (1, 0.123); select a, (select max(b) from t1) into outfile "../../tmp/subselect.out.file.1" from t1; delete from t1; load data infile "../../tmp/subselect.out.file.1" into table t1; select * from t1; a b 1 0.123 drop table t1; CREATE TABLE `t1` ( `id` int(11) NOT NULL auto_increment, `id_cns` tinyint(3) unsigned NOT NULL default '0', `tipo` enum('','UNO','DUE') NOT NULL default '', `anno_dep` smallint(4) unsigned zerofill NOT NULL default '0000', `particolare` mediumint(8) unsigned NOT NULL default '0', `generale` mediumint(8) unsigned NOT NULL default '0', `bis` tinyint(3) unsigned NOT NULL default '0', PRIMARY KEY (`id`), UNIQUE KEY `idx_cns_gen_anno` (`anno_dep`,`id_cns`,`generale`,`particolare`), UNIQUE KEY `idx_cns_par_anno` (`id_cns`,`anno_dep`,`tipo`,`particolare`,`bis`) ); INSERT INTO `t1` VALUES (1,16,'UNO',1987,2048,9681,0),(2,50,'UNO',1987,1536,13987,0),(3,16,'UNO',1987,2432,14594,0),(4,16,'UNO',1987,1792,13422,0),(5,16,'UNO',1987,1025,10240,0),(6,16,'UNO',1987,1026,7089,0); CREATE TABLE `t2` ( `id` tinyint(3) unsigned NOT NULL auto_increment, `max_anno_dep` smallint(6) unsigned NOT NULL default '0', PRIMARY KEY (`id`) ); INSERT INTO `t2` VALUES (16,1987),(50,1990),(51,1990); SELECT cns.id, cns.max_anno_dep, cns.max_anno_dep = (SELECT s.anno_dep FROM t1 AS s WHERE s.id_cns = cns.id ORDER BY s.anno_dep DESC LIMIT 1) AS PIPPO FROM t2 AS cns; id max_anno_dep PIPPO 16 1987 1 50 1990 0 51 1990 NULL DROP TABLE t1, t2; create table t1 (a int); insert into t1 values (1), (2), (3); SET SQL_SELECT_LIMIT=1; select sum(a) from (select * from t1) as a; sum(a) 6 select 2 in (select * from t1); 2 in (select * from t1) 1 SET SQL_SELECT_LIMIT=default; drop table t1; CREATE TABLE t1 (a int, b int, INDEX (a)); INSERT INTO t1 VALUES (1, 1), (1, 2), (1, 3); SELECT * FROM t1 WHERE a = (SELECT MAX(a) FROM t1 WHERE a = 1) ORDER BY b; a b 1 1 1 2 1 3 DROP TABLE t1; create table t1(val varchar(10)); insert into t1 values ('aaa'), ('bbb'),('eee'),('mmm'),('ppp'); select count(*) from t1 as w1 where w1.val in (select w2.val from t1 as w2 where w2.val like 'm%') and w1.val in (select w3.val from t1 as w3 where w3.val like 'e%'); count(*) 0 drop table t1; create table t1 (id int not null, text varchar(20) not null default '', primary key (id)); insert into t1 (id, text) values (1, 'text1'), (2, 'text2'), (3, 'text3'), (4, 'text4'), (5, 'text5'), (6, 'text6'), (7, 'text7'), (8, 'text8'), (9, 'text9'), (10, 'text10'), (11, 'text11'), (12, 'text12'); select * from t1 where id not in (select id from t1 where id < 8); id text 8 text8 9 text9 10 text10 11 text11 12 text12 select * from t1 as tt where not exists (select id from t1 where id < 8 and (id = tt.id or id is null) having id is not null); id text 8 text8 9 text9 10 text10 11 text11 12 text12 explain extended select * from t1 where id not in (select id from t1 where id < 8); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 12 100.00 Using where 2 SUBQUERY t1 range PRIMARY PRIMARY 4 NULL 7 100.00 Using where; Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`id` AS `id`,`test`.`t1`.`text` AS `text` from `test`.`t1` where (not(<in_optimizer>(`test`.`t1`.`id`,`test`.`t1`.`id` in ( <materialize> (/* select#2 */ select `test`.`t1`.`id` from `test`.`t1` where (`test`.`t1`.`id` < 8) ), <primary_index_lookup>(`test`.`t1`.`id` in <temporary table> on <auto_key> where ((`test`.`t1`.`id` = `materialized-subquery`.`id`))))))) explain extended select * from t1 as tt where not exists (select id from t1 where id < 8 and (id = tt.id or id is null) having id is not null); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY tt ALL NULL NULL NULL NULL 12 100.00 Using where 2 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 test.tt.id 1 100.00 Using where; Using index Warnings: Note 1276 Field or reference 'test.tt.id' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`tt`.`id` AS `id`,`test`.`tt`.`text` AS `text` from `test`.`t1` `tt` where (not(exists(/* select#2 */ select `test`.`t1`.`id` from `test`.`t1` where ((`test`.`t1`.`id` < 8) and (`test`.`t1`.`id` = `test`.`tt`.`id`)) having (`test`.`t1`.`id` is not null)))) insert into t1 (id, text) values (1000, 'text1000'), (1001, 'text1001'); create table t2 (id int not null, text varchar(20) not null default '', primary key (id)); insert into t2 (id, text) values (1, 'text1'), (2, 'text2'), (3, 'text3'), (4, 'text4'), (5, 'text5'), (6, 'text6'), (7, 'text7'), (8, 'text8'), (9, 'text9'), (10, 'text10'), (11, 'text1'), (12, 'text2'), (13, 'text3'), (14, 'text4'), (15, 'text5'), (16, 'text6'), (17, 'text7'), (18, 'text8'), (19, 'text9'), (20, 'text10'),(21, 'text1'), (22, 'text2'), (23, 'text3'), (24, 'text4'), (25, 'text5'), (26, 'text6'), (27, 'text7'), (28, 'text8'), (29, 'text9'), (30, 'text10'), (31, 'text1'), (32, 'text2'), (33, 'text3'), (34, 'text4'), (35, 'text5'), (36, 'text6'), (37, 'text7'), (38, 'text8'), (39, 'text9'), (40, 'text10'), (41, 'text1'), (42, 'text2'), (43, 'text3'), (44, 'text4'), (45, 'text5'), (46, 'text6'), (47, 'text7'), (48, 'text8'), (49, 'text9'), (50, 'text10'); select * from t1 a left join t2 b on (a.id=b.id or b.id is null) join t1 c on (if(isnull(b.id), 1000, b.id)=c.id); id text id text id text 1 text1 1 text1 1 text1 2 text2 2 text2 2 text2 3 text3 3 text3 3 text3 4 text4 4 text4 4 text4 5 text5 5 text5 5 text5 6 text6 6 text6 6 text6 7 text7 7 text7 7 text7 8 text8 8 text8 8 text8 9 text9 9 text9 9 text9 10 text10 10 text10 10 text10 11 text11 11 text1 11 text11 12 text12 12 text2 12 text12 1000 text1000 NULL NULL 1000 text1000 1001 text1001 NULL NULL 1000 text1000 explain extended select * from t1 a left join t2 b on (a.id=b.id or b.id is null) join t1 c on (if(isnull(b.id), 1000, b.id)=c.id); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE a ALL NULL NULL NULL NULL 14 100.00 NULL 1 SIMPLE b eq_ref PRIMARY PRIMARY 4 test.a.id 2 100.00 NULL 1 SIMPLE c eq_ref PRIMARY PRIMARY 4 func 1 100.00 Using index condition Warnings: Note 1003 /* select#1 */ select `test`.`a`.`id` AS `id`,`test`.`a`.`text` AS `text`,`test`.`b`.`id` AS `id`,`test`.`b`.`text` AS `text`,`test`.`c`.`id` AS `id`,`test`.`c`.`text` AS `text` from `test`.`t1` `a` left join `test`.`t2` `b` on(((`test`.`b`.`id` = `test`.`a`.`id`) or isnull(`test`.`b`.`id`))) join `test`.`t1` `c` where (if(isnull(`test`.`b`.`id`),1000,`test`.`b`.`id`) = `test`.`c`.`id`) drop table t1,t2; create table t1 (a int); insert into t1 values (1); explain select benchmark(1000, (select a from t1 where a=sha(rand()))); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used 2 UNCACHEABLE SUBQUERY t1 system NULL NULL NULL NULL 1 NULL drop table t1; create table t1(id int); create table t2(id int); create table t3(flag int); select (select * from t3 where id not null) from t1, t2; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'null) from t1, t2' at line 1 drop table t1,t2,t3; CREATE TABLE t1 (id INT); CREATE TABLE t2 (id INT); INSERT INTO t1 VALUES (1), (2); INSERT INTO t2 VALUES (1); SELECT t1.id, ( SELECT COUNT(t.id) FROM t2 AS t WHERE t.id = t1.id ) AS c FROM t1 LEFT JOIN t2 USING (id); id c 1 1 2 0 SELECT id, ( SELECT COUNT(t.id) FROM t2 AS t WHERE t.id = t1.id ) AS c FROM t1 LEFT JOIN t2 USING (id); id c 1 1 2 0 SELECT t1.id, ( SELECT COUNT(t.id) FROM t2 AS t WHERE t.id = t1.id ) AS c FROM t1 LEFT JOIN t2 USING (id) ORDER BY t1.id; id c 1 1 2 0 SELECT id, ( SELECT COUNT(t.id) FROM t2 AS t WHERE t.id = t1.id ) AS c FROM t1 LEFT JOIN t2 USING (id) ORDER BY id; id c 1 1 2 0 DROP TABLE t1,t2; CREATE TABLE t1 ( a int, b int ); INSERT INTO t1 VALUES (1,1),(2,2),(3,3); SELECT a FROM t1 WHERE a > ANY ( SELECT a FROM t1 WHERE b = 2 ); a 3 SELECT a FROM t1 WHERE a < ANY ( SELECT a FROM t1 WHERE b = 2 ); a 1 SELECT a FROM t1 WHERE a = ANY ( SELECT a FROM t1 WHERE b = 2 ); a 2 SELECT a FROM t1 WHERE a >= ANY ( SELECT a FROM t1 WHERE b = 2 ); a 2 3 SELECT a FROM t1 WHERE a <= ANY ( SELECT a FROM t1 WHERE b = 2 ); a 1 2 SELECT a FROM t1 WHERE a <> ANY ( SELECT a FROM t1 WHERE b = 2 ); a 1 3 SELECT a FROM t1 WHERE a > ALL ( SELECT a FROM t1 WHERE b = 2 ); a 3 SELECT a FROM t1 WHERE a < ALL ( SELECT a FROM t1 WHERE b = 2 ); a 1 SELECT a FROM t1 WHERE a = ALL ( SELECT a FROM t1 WHERE b = 2 ); a 2 SELECT a FROM t1 WHERE a >= ALL ( SELECT a FROM t1 WHERE b = 2 ); a 2 3 SELECT a FROM t1 WHERE a <= ALL ( SELECT a FROM t1 WHERE b = 2 ); a 1 2 SELECT a FROM t1 WHERE a <> ALL ( SELECT a FROM t1 WHERE b = 2 ); a 1 3 ALTER TABLE t1 ADD INDEX (a); SELECT a FROM t1 WHERE a > ANY ( SELECT a FROM t1 WHERE b = 2 ); a 3 SELECT a FROM t1 WHERE a < ANY ( SELECT a FROM t1 WHERE b = 2 ); a 1 SELECT a FROM t1 WHERE a = ANY ( SELECT a FROM t1 WHERE b = 2 ); a 2 SELECT a FROM t1 WHERE a >= ANY ( SELECT a FROM t1 WHERE b = 2 ); a 2 3 SELECT a FROM t1 WHERE a <= ANY ( SELECT a FROM t1 WHERE b = 2 ); a 1 2 SELECT a FROM t1 WHERE a <> ANY ( SELECT a FROM t1 WHERE b = 2 ); a 1 3 SELECT a FROM t1 WHERE a > ALL ( SELECT a FROM t1 WHERE b = 2 ); a 3 SELECT a FROM t1 WHERE a < ALL ( SELECT a FROM t1 WHERE b = 2 ); a 1 SELECT a FROM t1 WHERE a = ALL ( SELECT a FROM t1 WHERE b = 2 ); a 2 SELECT a FROM t1 WHERE a >= ALL ( SELECT a FROM t1 WHERE b = 2 ); a 2 3 SELECT a FROM t1 WHERE a <= ALL ( SELECT a FROM t1 WHERE b = 2 ); a 1 2 SELECT a FROM t1 WHERE a <> ALL ( SELECT a FROM t1 WHERE b = 2 ); a 1 3 SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 HAVING a = 2); a 3 SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 HAVING a = 2); a 1 SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 HAVING a = 2); a 2 SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 HAVING a = 2); a 2 3 SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 HAVING a = 2); a 1 2 SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 HAVING a = 2); a 1 3 SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 HAVING a = 2); a 3 SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 HAVING a = 2); a 1 SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 HAVING a = 2); a 2 SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 HAVING a = 2); a 2 3 SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 HAVING a = 2); a 1 2 SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 HAVING a = 2); a 1 3 SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 3 SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 1 SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 2 SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 2 3 SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 1 2 SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 1 3 SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 3 SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 1 SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 2 SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 2 3 SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 1 2 SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2); a 1 3 SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 3 SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 1 SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 2 SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 2 3 SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 1 2 SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 1 3 SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 3 SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 1 SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 2 SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 2 3 SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 1 2 SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2); a 1 3 SELECT a FROM t1 WHERE (1,2) > ANY (SELECT a FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE a > ANY (SELECT a,2 FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE (1,2) > ANY (SELECT a,2 FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE (1,2) > ALL (SELECT a FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE a > ALL (SELECT a,2 FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE (1,2) > ALL (SELECT a,2 FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE (1,2) = ALL (SELECT a,2 FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE (1,2) <> ANY (SELECT a,2 FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE (1,2) = ANY (SELECT a FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 2 column(s) SELECT a FROM t1 WHERE a = ANY (SELECT a,2 FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE (1,2) = ANY (SELECT a,2 FROM t1 WHERE b = 2); a SELECT a FROM t1 WHERE (1,2) <> ALL (SELECT a FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 2 column(s) SELECT a FROM t1 WHERE a <> ALL (SELECT a,2 FROM t1 WHERE b = 2); ERROR 21000: Operand should contain 1 column(s) SELECT a FROM t1 WHERE (1,2) <> ALL (SELECT a,2 FROM t1 WHERE b = 2); a 1 2 3 SELECT a FROM t1 WHERE (a,1) = ANY (SELECT a,1 FROM t1 WHERE b = 2); a 2 SELECT a FROM t1 WHERE (a,1) <> ALL (SELECT a,1 FROM t1 WHERE b = 2); a 1 3 SELECT a FROM t1 WHERE (a,1) = ANY (SELECT a,1 FROM t1 HAVING a = 2); a 2 SELECT a FROM t1 WHERE (a,1) <> ALL (SELECT a,1 FROM t1 HAVING a = 2); a 1 3 SELECT a FROM t1 WHERE (a,1) = ANY (SELECT a,1 FROM t1 WHERE b = 2 UNION SELECT a,1 FROM t1 WHERE b = 2); a 2 SELECT a FROM t1 WHERE (a,1) <> ALL (SELECT a,1 FROM t1 WHERE b = 2 UNION SELECT a,1 FROM t1 WHERE b = 2); a 1 3 SELECT a FROM t1 WHERE (a,1) = ANY (SELECT a,1 FROM t1 HAVING a = 2 UNION SELECT a,1 FROM t1 HAVING a = 2); a 2 SELECT a FROM t1 WHERE (a,1) <> ALL (SELECT a,1 FROM t1 HAVING a = 2 UNION SELECT a,1 FROM t1 HAVING a = 2); a 1 3 SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 WHERE b = 2 group by a); a 3 SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 WHERE b = 2 group by a); a 1 SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 WHERE b = 2 group by a); a 2 SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 WHERE b = 2 group by a); a 2 3 SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 WHERE b = 2 group by a); a 1 2 SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 WHERE b = 2 group by a); a 1 3 SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 WHERE b = 2 group by a); a 3 SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 WHERE b = 2 group by a); a 1 SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 WHERE b = 2 group by a); a 2 SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 WHERE b = 2 group by a); a 2 3 SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 WHERE b = 2 group by a); a 1 2 SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 WHERE b = 2 group by a); a 1 3 SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 group by a HAVING a = 2); a 3 SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 group by a HAVING a = 2); a 1 SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 group by a HAVING a = 2); a 2 SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 group by a HAVING a = 2); a 2 3 SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 group by a HAVING a = 2); a 1 2 SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 group by a HAVING a = 2); a 1 3 SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 group by a HAVING a = 2); a 3 SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 group by a HAVING a = 2); a 1 SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 group by a HAVING a = 2); a 2 SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 group by a HAVING a = 2); a 2 3 SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 group by a HAVING a = 2); a 1 2 SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 group by a HAVING a = 2); a 1 3 SELECT concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a > t1.a), '-') from t1 a; concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a > t1.a), '-') 0- 0- 1- SELECT concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a < t1.a), '-') from t1 a; concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a < t1.a), '-') 1- 0- 0- SELECT concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a = t1.a), '-') from t1 a; concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a = t1.a), '-') 0- 1- 0- DROP TABLE t1; CREATE TABLE t1 ( a double, b double ); INSERT INTO t1 VALUES (1,1),(2,2),(3,3); SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 WHERE b = 2e0); a 3 SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 WHERE b = 2e0); a 1 SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 WHERE b = 2e0); a 2 SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 WHERE b = 2e0); a 2 3 SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 WHERE b = 2e0); a 1 2 SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 WHERE b = 2e0); a 1 3 SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 WHERE b = 2e0); a 3 SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 WHERE b = 2e0); a 1 SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 WHERE b = 2e0); a 2 SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 WHERE b = 2e0); a 2 3 SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 WHERE b = 2e0); a 1 2 SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 WHERE b = 2e0); a 1 3 DROP TABLE t1; CREATE TABLE t1 ( a char(1), b char(1)); INSERT INTO t1 VALUES ('1','1'),('2','2'),('3','3'); SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 WHERE b = '2'); a 3 SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 WHERE b = '2'); a 1 SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 WHERE b = '2'); a 2 SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 WHERE b = '2'); a 2 3 SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 WHERE b = '2'); a 1 2 SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 WHERE b = '2'); a 1 3 SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 WHERE b = '2'); a 3 SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 WHERE b = '2'); a 1 SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 WHERE b = '2'); a 2 SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 WHERE b = '2'); a 2 3 SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 WHERE b = '2'); a 1 2 SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 WHERE b = '2'); a 1 3 DROP TABLE t1; create table t1 (a int, b int); insert into t1 values (1,2),(3,4); select * from t1 up where exists (select * from t1 where t1.a=up.a); a b 1 2 3 4 explain extended select * from t1 up where exists (select * from t1 where t1.a=up.a); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY up ALL NULL NULL NULL NULL 2 100.00 Using where 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1276 Field or reference 'test.up.a' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`up`.`a` AS `a`,`test`.`up`.`b` AS `b` from `test`.`t1` `up` where exists(/* select#2 */ select 1 from `test`.`t1` where (`test`.`t1`.`a` = `test`.`up`.`a`)) drop table t1; CREATE TABLE t1 (t1_a int); INSERT INTO t1 VALUES (1); CREATE TABLE t2 (t2_a int, t2_b int, PRIMARY KEY (t2_a, t2_b)); INSERT INTO t2 VALUES (1, 1), (1, 2); SELECT * FROM t1, t2 table2 WHERE t1_a = 1 AND table2.t2_a = 1 HAVING table2.t2_b = (SELECT MAX(t2_b) FROM t2 WHERE t2_a = table2.t2_a); t1_a t2_a t2_b 1 1 2 DROP TABLE t1, t2; CREATE TABLE t1 (id int(11) default NULL,name varchar(10) default NULL); INSERT INTO t1 VALUES (1,'Tim'),(2,'Rebecca'),(3,NULL); CREATE TABLE t2 (id int(11) default NULL, pet varchar(10) default NULL); INSERT INTO t2 VALUES (1,'Fido'),(2,'Spot'),(3,'Felix'); SELECT a.*, b.* FROM (SELECT * FROM t1) AS a JOIN t2 as b on a.id=b.id; id name id pet 1 Tim 1 Fido 2 Rebecca 2 Spot 3 NULL 3 Felix drop table t1,t2; CREATE TABLE t1 ( a int, b int ); CREATE TABLE t2 ( c int, d int ); INSERT INTO t1 VALUES (1,2), (2,3), (3,4); SELECT a AS abc, b FROM t1 outr WHERE b = (SELECT MIN(b) FROM t1 WHERE a=outr.a); abc b 1 2 2 3 3 4 INSERT INTO t2 SELECT a AS abc, b FROM t1 outr WHERE b = (SELECT MIN(b) FROM t1 WHERE a=outr.a); select * from t2; c d 1 2 2 3 3 4 CREATE TABLE t3 SELECT a AS abc, b FROM t1 outr WHERE b = (SELECT MIN(b) FROM t1 WHERE a=outr.a); select * from t3; abc b 1 2 2 3 3 4 prepare stmt1 from "INSERT INTO t2 SELECT a AS abc, b FROM t1 outr WHERE b = (SELECT MIN(b) FROM t1 WHERE a=outr.a);"; execute stmt1; deallocate prepare stmt1; select * from t2; c d 1 2 2 3 3 4 1 2 2 3 3 4 drop table t3; prepare stmt1 from "CREATE TABLE t3 SELECT a AS abc, b FROM t1 outr WHERE b = (SELECT MIN(b) FROM t1 WHERE a=outr.a);"; execute stmt1; select * from t3; abc b 1 2 2 3 3 4 deallocate prepare stmt1; DROP TABLE t1, t2, t3; CREATE TABLE `t1` ( `a` int(11) default NULL) ENGINE=MyISAM DEFAULT CHARSET=latin1; insert into t1 values (1); CREATE TABLE `t2` ( `b` int(11) default NULL, `a` int(11) default NULL) ENGINE=MyISAM DEFAULT CHARSET=latin1; insert into t2 values (1,2); select t000.a, count(*) `C` FROM t1 t000 GROUP BY t000.a HAVING count(*) > ALL (SELECT count(*) FROM t2 t001 WHERE t001.a=1); a C 1 1 drop table t1,t2; create table t1 (a int not null auto_increment primary key, b varchar(40), fulltext(b)); insert into t1 (b) values ('ball'),('ball games'), ('games'), ('foo'), ('foobar'), ('Serg'), ('Sergei'),('Georg'), ('Patrik'),('Hakan'); create table t2 (a int); insert into t2 values (1),(3),(2),(7); select a,b from t1 where match(b) against ('Ball') > 0; a b 1 ball 2 ball games select a from t2 where a in (select a from t1 where match(b) against ('Ball') > 0); a 1 2 drop table t1,t2; CREATE TABLE t1(`IZAVORGANG_ID` VARCHAR(11) CHARACTER SET latin1 COLLATE latin1_bin,`KUERZEL` VARCHAR(10) CHARACTER SET latin1 COLLATE latin1_bin,`IZAANALYSEART_ID` VARCHAR(11) CHARACTER SET latin1 COLLATE latin1_bin,`IZAPMKZ_ID` VARCHAR(11) CHARACTER SET latin1 COLLATE latin1_bin); CREATE INDEX AK01IZAVORGANG ON t1(izaAnalyseart_id,Kuerzel); INSERT INTO t1(`IZAVORGANG_ID`,`KUERZEL`,`IZAANALYSEART_ID`,`IZAPMKZ_ID`)VALUES('D0000000001','601','D0000000001','I0000000001'); INSERT INTO t1(`IZAVORGANG_ID`,`KUERZEL`,`IZAANALYSEART_ID`,`IZAPMKZ_ID`)VALUES('D0000000002','602','D0000000001','I0000000001'); INSERT INTO t1(`IZAVORGANG_ID`,`KUERZEL`,`IZAANALYSEART_ID`,`IZAPMKZ_ID`)VALUES('D0000000003','603','D0000000001','I0000000001'); INSERT INTO t1(`IZAVORGANG_ID`,`KUERZEL`,`IZAANALYSEART_ID`,`IZAPMKZ_ID`)VALUES('D0000000004','101','D0000000001','I0000000001'); SELECT `IZAVORGANG_ID` FROM t1 WHERE `KUERZEL` IN(SELECT MIN(`KUERZEL`)`Feld1` FROM t1 WHERE `KUERZEL` LIKE'601%'And`IZAANALYSEART_ID`='D0000000001'); IZAVORGANG_ID D0000000001 drop table t1; CREATE TABLE `t1` ( `aid` int(11) NOT NULL default '0', `bid` int(11) NOT NULL default '0', PRIMARY KEY (`aid`,`bid`)); CREATE TABLE `t2` ( `aid` int(11) NOT NULL default '0', `bid` int(11) NOT NULL default '0', PRIMARY KEY (`aid`,`bid`)); insert into t1 values (1,1),(1,2),(2,1),(2,2); insert into t2 values (1,2),(2,2); select * from t1 where t1.aid not in (select aid from t2 where bid=t1.bid); aid bid 1 1 2 1 alter table t2 drop primary key; alter table t2 add key KEY1 (aid, bid); select * from t1 where t1.aid not in (select aid from t2 where bid=t1.bid); aid bid 1 1 2 1 alter table t2 drop key KEY1; alter table t2 add primary key (bid, aid); select * from t1 where t1.aid not in (select aid from t2 where bid=t1.bid); aid bid 1 1 2 1 drop table t1,t2; CREATE TABLE t1 (howmanyvalues bigint, avalue int); INSERT INTO t1 VALUES (1, 1),(2, 1),(2, 2),(3, 1),(3, 2),(3, 3),(4, 1),(4, 2),(4, 3),(4, 4); SELECT howmanyvalues, count(*) from t1 group by howmanyvalues; howmanyvalues count(*) 1 1 2 2 3 3 4 4 SELECT a.howmanyvalues, (SELECT count(*) from t1 b where b.howmanyvalues = a.howmanyvalues) as mycount from t1 a group by a.howmanyvalues; howmanyvalues mycount 1 1 2 2 3 3 4 4 CREATE INDEX t1_howmanyvalues_idx ON t1 (howmanyvalues); SELECT a.howmanyvalues, (SELECT count(*) from t1 b where b.howmanyvalues+1 = a.howmanyvalues+1) as mycount from t1 a group by a.howmanyvalues; howmanyvalues mycount 1 1 2 2 3 3 4 4 SELECT a.howmanyvalues, (SELECT count(*) from t1 b where b.howmanyvalues = a.howmanyvalues) as mycount from t1 a group by a.howmanyvalues; howmanyvalues mycount 1 1 2 2 3 3 4 4 SELECT a.howmanyvalues, (SELECT count(*) from t1 b where b.howmanyvalues = a.avalue) as mycount from t1 a group by a.howmanyvalues; howmanyvalues mycount 1 1 2 1 3 1 4 1 drop table t1; create table t1 (x int); select (select b.x from t1 as b where b.x=a.x) from t1 as a where a.x=2 group by a.x; (select b.x from t1 as b where b.x=a.x) drop table t1; CREATE TABLE `t1` ( `master` int(10) unsigned NOT NULL default '0', `map` smallint(6) unsigned NOT NULL default '0', `slave` int(10) unsigned NOT NULL default '0', `access` int(10) unsigned NOT NULL default '0', UNIQUE KEY `access_u` (`master`,`map`,`slave`)); INSERT INTO `t1` VALUES (1,0,0,700),(1,1,1,400),(1,5,5,400),(1,12,12,400),(1,12,32,400),(4,12,32,400); CREATE TABLE `t2` ( `id` int(10) unsigned NOT NULL default '0', `pid` int(10) unsigned NOT NULL default '0', `map` smallint(6) unsigned NOT NULL default '0', `level` tinyint(4) unsigned NOT NULL default '0', `title` varchar(255) default NULL, PRIMARY KEY (`id`,`pid`,`map`), KEY `level` (`level`), KEY `id` (`id`,`map`)) ; INSERT INTO `t2` VALUES (6,5,12,7,'a'),(12,0,0,7,'a'),(12,1,0,7,'a'),(12,5,5,7,'a'),(12,5,12,7,'a'); SELECT b.sc FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b; ERROR 42S22: Unknown column 'b.sc' in 'field list' SELECT b.ac FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b; ac 700 NULL drop tables t1,t2; create table t1 (a int not null, b int not null, c int, primary key (a,b)); insert into t1 values (1,1,1), (2,2,2), (3,3,3); set @b:= 0; explain select sum(a) from t1 where b > @b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL PRIMARY 8 NULL 3 Using where; Using index set @a:= (select sum(a) from t1 where b > @b); explain select a from t1 where c=2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where do @a:= (select sum(a) from t1 where b > @b); explain select a from t1 where c=2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where drop table t1; set @got_val= (SELECT 1 FROM (SELECT 'A' as my_col) as T1 ) ; create table t1 (a int, b int); create table t2 (a int, b int); insert into t1 values (1,1),(1,2),(1,3),(2,4),(2,5); insert into t2 values (1,3),(2,1); select distinct a,b, (select max(b) from t2 where t1.b=t2.a) from t1 order by t1.b; a b (select max(b) from t2 where t1.b=t2.a) 1 1 3 1 2 1 1 3 NULL 2 4 NULL 2 5 NULL drop table t1, t2; create table t1 (id int); create table t2 (id int, body text, fulltext (body)); insert into t1 values(1),(2),(3); insert into t2 values (1,'test'), (2,'mysql'), (3,'test'), (4,'test'); select count(distinct id) from t1 where id in (select id from t2 where match(body) against ('mysql' in boolean mode)); count(distinct id) 1 drop table t2,t1; create table t1 (s1 int,s2 int); insert into t1 values (20,15); select * from t1 where (('a',null) <=> (select 'a',s2 from t1 where s1 = 0)); s1 s2 drop table t1; create table t1 (s1 int); insert into t1 values (1),(null); select * from t1 where s1 < all (select s1 from t1); s1 select s1, s1 < all (select s1 from t1) from t1; s1 s1 < all (select s1 from t1) 1 0 NULL NULL drop table t1; CREATE TABLE t1 ( Code char(3) NOT NULL default '', Name char(52) NOT NULL default '', Continent enum('Asia','Europe','North America','Africa','Oceania','Antarctica','South America') NOT NULL default 'Asia', Region char(26) NOT NULL default '', SurfaceArea float(10,2) NOT NULL default '0.00', IndepYear smallint(6) default NULL, Population int(11) NOT NULL default '0', LifeExpectancy float(3,1) default NULL, GNP float(10,2) default NULL, GNPOld float(10,2) default NULL, LocalName char(45) NOT NULL default '', GovernmentForm char(45) NOT NULL default '', HeadOfState char(60) default NULL, Capital int(11) default NULL, Code2 char(2) NOT NULL default '' ) ENGINE=MyISAM; INSERT INTO t1 VALUES ('XXX','Xxxxx','Oceania','Xxxxxx',26.00,0,0,0,0,0,'Xxxxx','Xxxxx','Xxxxx',NULL,'XX'); INSERT INTO t1 VALUES ('ASM','American Samoa','Oceania','Polynesia',199.00,0,68000,75.1,334.00,NULL,'Amerika Samoa','US Territory','George W. Bush',54,'AS'); INSERT INTO t1 VALUES ('ATF','French Southern territories','Antarctica','Antarctica',7780.00,0,0,NULL,0.00,NULL,'Terres australes françaises','Nonmetropolitan Territory of France','Jacques Chirac',NULL,'TF'); INSERT INTO t1 VALUES ('UMI','United States Minor Outlying Islands','Oceania','Micronesia/Caribbean',16.00,0,0,NULL,0.00,NULL,'United States Minor Outlying Islands','Dependent Territory of the US','George W. Bush',NULL,'UM'); /*!40000 ALTER TABLE t1 ENABLE KEYS */; SELECT DISTINCT Continent AS c FROM t1 outr WHERE Code <> SOME ( SELECT Code FROM t1 WHERE Continent = outr.Continent AND Population < 200); c Oceania drop table t1; create table t1 (a1 int); create table t2 (b1 int); select * from t1 where a2 > any(select b1 from t2); ERROR 42S22: Unknown column 'a2' in 'IN/ALL/ANY subquery' select * from t1 where a1 > any(select b1 from t2); a1 drop table t1,t2; create table t1 (a integer, b integer); select (select * from t1) = (select 1,2); (select * from t1) = (select 1,2) NULL select (select 1,2) = (select * from t1); (select 1,2) = (select * from t1) NULL select row(1,2) = ANY (select * from t1); row(1,2) = ANY (select * from t1) 0 select row(1,2) != ALL (select * from t1); row(1,2) != ALL (select * from t1) 1 drop table t1; create table t1 (a integer, b integer); select row(1,(2,2)) in (select * from t1 ); ERROR 21000: Operand should contain 2 column(s) select row(1,(2,2)) = (select * from t1 ); ERROR 21000: Operand should contain 2 column(s) select (select * from t1) = row(1,(2,2)); ERROR 21000: Operand should contain 1 column(s) drop table t1; create table t1 (a integer); insert into t1 values (1); select 1 = ALL (select 1 from t1 where 1 = xx ), 1 as xx ; ERROR 42S22: Reference 'xx' not supported (forward reference in item list) select 1 = ALL (select 1 from t1 where 1 = xx ), 1 as xx; ERROR 42S22: Reference 'xx' not supported (forward reference in item list) select 1 as xx, 1 = ALL ( select 1 from t1 where 1 = xx ); xx 1 = ALL ( select 1 from t1 where 1 = xx ) 1 1 select 1 = ALL (select 1 from t1 where 1 = xx ), 1 as xx; ERROR 42S22: Reference 'xx' not supported (forward reference in item list) select 1 = ALL (select 1 from t1 where 1 = xx ), 1 as xx from DUAL; ERROR 42S22: Reference 'xx' not supported (forward reference in item list) drop table t1; CREATE TABLE t1 ( categoryId int(11) NOT NULL, courseId int(11) NOT NULL, startDate datetime NOT NULL, endDate datetime NOT NULL, createDate datetime NOT NULL, modifyDate timestamp NOT NULL, attributes text NOT NULL ); INSERT INTO t1 VALUES (1,41,'2004-02-09','2010-01-01','2004-02-09','2004-02-09',''), (1,86,'2004-08-16','2004-08-16','2004-08-16','2004-08-16',''), (1,87,'2004-08-16','2004-08-16','2004-08-16','2004-08-16',''), (2,52,'2004-03-15','2004-10-01','2004-03-15','2004-09-17',''), (2,53,'2004-03-16','2004-10-01','2004-03-16','2004-09-17',''), (2,88,'2004-08-16','2004-08-16','2004-08-16','2004-08-16',''), (2,89,'2004-08-16','2004-08-16','2004-08-16','2004-08-16',''), (3,51,'2004-02-09','2010-01-01','2004-02-09','2004-02-09',''), (5,12,'2004-02-18','2010-01-01','2004-02-18','2004-02-18',''); CREATE TABLE t2 ( userId int(11) NOT NULL, courseId int(11) NOT NULL, date datetime NOT NULL ); INSERT INTO t2 VALUES (5141,71,'2003-11-18'), (5141,72,'2003-11-25'),(5141,41,'2004-08-06'), (5141,52,'2004-08-06'),(5141,53,'2004-08-06'), (5141,12,'2004-08-06'),(5141,86,'2004-10-21'), (5141,87,'2004-10-21'),(5141,88,'2004-10-21'), (5141,89,'2004-10-22'),(5141,51,'2004-10-26'); CREATE TABLE t3 ( groupId int(11) NOT NULL, parentId int(11) NOT NULL, startDate datetime NOT NULL, endDate datetime NOT NULL, createDate datetime NOT NULL, modifyDate timestamp NOT NULL, ordering int(11) ); INSERT INTO t3 VALUES (12,9,'1000-01-01','3999-12-31','2004-01-29','2004-01-29',NULL); CREATE TABLE t4 ( id int(11) NOT NULL, groupTypeId int(11) NOT NULL, groupKey varchar(50) NOT NULL, name text, ordering int(11), description text, createDate datetime NOT NULL, modifyDate timestamp NOT NULL ); INSERT INTO t4 VALUES (9,5,'stationer','stationer',0,'Stationer','2004-01-29','2004-01-29'), (12,5,'group2','group2',0,'group2','2004-01-29','2004-01-29'); CREATE TABLE t5 ( userId int(11) NOT NULL, groupId int(11) NOT NULL, createDate datetime NOT NULL, modifyDate timestamp NOT NULL ); INSERT INTO t5 VALUES (5141,12,'2004-08-06','2004-08-06'); select count(distinct t2.userid) pass, groupstuff.*, count(t2.courseid) crse, t1.categoryid, t2.courseid, date_format(date, '%b%y') as colhead from t2 join t1 on t2.courseid=t1.courseid join ( select t5.userid, parentid, parentgroup, childid, groupname, grouptypeid from t5 join ( select t4.id as parentid, t4.name as parentgroup, t4.id as childid, t4.name as groupname, t4.grouptypeid from t4 ) as gin on t5.groupid=gin.childid ) as groupstuff on t2.userid = groupstuff.userid group by groupstuff.groupname, colhead , t2.courseid; pass userid parentid parentgroup childid groupname grouptypeid crse categoryid courseid colhead 1 5141 12 group2 12 group2 5 1 5 12 Aug04 1 5141 12 group2 12 group2 5 1 1 41 Aug04 1 5141 12 group2 12 group2 5 1 2 52 Aug04 1 5141 12 group2 12 group2 5 1 2 53 Aug04 1 5141 12 group2 12 group2 5 1 3 51 Oct04 1 5141 12 group2 12 group2 5 1 1 86 Oct04 1 5141 12 group2 12 group2 5 1 1 87 Oct04 1 5141 12 group2 12 group2 5 1 2 88 Oct04 1 5141 12 group2 12 group2 5 1 2 89 Oct04 drop table t1, t2, t3, t4, t5; create table t1 (a int); insert into t1 values (1), (2), (3); SELECT 1 FROM t1 WHERE (SELECT 1) in (SELECT 1); 1 1 1 1 drop table t1; create table t1 (a int); create table t2 (a int); insert into t1 values (1),(2); insert into t2 values (0),(1),(2),(3); select a from t2 where a in (select a from t1); a 1 2 select a from t2 having a in (select a from t1); a 1 2 prepare stmt1 from "select a from t2 where a in (select a from t1)"; execute stmt1; a 1 2 execute stmt1; a 1 2 deallocate prepare stmt1; prepare stmt1 from "select a from t2 having a in (select a from t1)"; execute stmt1; a 1 2 execute stmt1; a 1 2 deallocate prepare stmt1; drop table t1, t2; create table t1 (a int, b int); insert into t1 values (1,2); select 1 = (select * from t1); ERROR 21000: Operand should contain 1 column(s) select (select * from t1) = 1; ERROR 21000: Operand should contain 2 column(s) select (1,2) = (select a from t1); ERROR 21000: Operand should contain 2 column(s) select (select a from t1) = (1,2); ERROR 21000: Operand should contain 1 column(s) select (1,2,3) = (select * from t1); ERROR 21000: Operand should contain 3 column(s) select (select * from t1) = (1,2,3); ERROR 21000: Operand should contain 2 column(s) drop table t1; CREATE TABLE `t1` ( `itemid` bigint(20) unsigned NOT NULL auto_increment, `sessionid` bigint(20) unsigned default NULL, `time` int(10) unsigned NOT NULL default '0', `type` set('A','D','E','F','G','I','L','N','U') collate latin1_general_ci NOT NULL default '', `data` text collate latin1_general_ci NOT NULL, PRIMARY KEY (`itemid`) ) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci; INSERT INTO `t1` VALUES (1, 1, 1, 'D', ''); CREATE TABLE `t2` ( `sessionid` bigint(20) unsigned NOT NULL auto_increment, `pid` int(10) unsigned NOT NULL default '0', `date` int(10) unsigned NOT NULL default '0', `ip` varchar(15) collate latin1_general_ci NOT NULL default '', PRIMARY KEY (`sessionid`) ) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci; INSERT INTO `t2` VALUES (1, 1, 1, '10.10.10.1'); SELECT s.ip, count( e.itemid ) FROM `t1` e JOIN t2 s ON s.sessionid = e.sessionid WHERE e.sessionid = ( SELECT sessionid FROM t2 ORDER BY sessionid DESC LIMIT 1 ) GROUP BY s.ip HAVING count( e.itemid ) >0 LIMIT 0 , 30; ip count( e.itemid ) 10.10.10.1 1 drop tables t1,t2; create table t1 (fld enum('0','1')); insert into t1 values ('1'); select * from (select max(fld) from t1) as foo; max(fld) 1 drop table t1; CREATE TABLE t1 (a int); CREATE TABLE t2 (a int, b int); CREATE TABLE t3 (b int NOT NULL); INSERT INTO t1 VALUES (1), (2), (3), (4); INSERT INTO t2 VALUES (1,10), (3,30); SELECT * FROM t2 LEFT JOIN t3 ON t2.b=t3.b WHERE t3.b IS NOT NULL OR t2.a > 10; a b b SELECT * FROM t1 WHERE t1.a NOT IN (SELECT a FROM t2 LEFT JOIN t3 ON t2.b=t3.b WHERE t3.b IS NOT NULL OR t2.a > 10); a 1 2 3 4 DROP TABLE t1,t2,t3; CREATE TABLE t1 (f1 INT); CREATE TABLE t2 (f2 INT); INSERT INTO t1 VALUES (1); SELECT * FROM t1 WHERE f1 > ALL (SELECT f2 FROM t2); f1 1 SELECT * FROM t1 WHERE f1 > ALL (SELECT f2 FROM t2 WHERE 1=0); f1 1 INSERT INTO t2 VALUES (1); INSERT INTO t2 VALUES (2); SELECT * FROM t1 WHERE f1 > ALL (SELECT f2 FROM t2 WHERE f2=0); f1 1 DROP TABLE t1, t2; select 1 from dual where 1 < any (select 2); 1 1 select 1 from dual where 1 < all (select 2); 1 1 select 1 from dual where 2 > any (select 1); 1 1 select 1 from dual where 2 > all (select 1); 1 1 select 1 from dual where 1 < any (select 2 from dual); 1 1 select 1 from dual where 1 < all (select 2 from dual where 1!=1); 1 1 create table t1 (s1 char); insert into t1 values (1),(2); select * from t1 where (s1 < any (select s1 from t1)); s1 1 select * from t1 where not (s1 < any (select s1 from t1)); s1 2 select * from t1 where (s1 < ALL (select s1+1 from t1)); s1 1 select * from t1 where not(s1 < ALL (select s1+1 from t1)); s1 2 select * from t1 where (s1+1 = ANY (select s1 from t1)); s1 1 select * from t1 where NOT(s1+1 = ANY (select s1 from t1)); s1 2 select * from t1 where (s1 = ALL (select s1/s1 from t1)); s1 1 select * from t1 where NOT(s1 = ALL (select s1/s1 from t1)); s1 2 drop table t1; create table t1 ( retailerID varchar(8) NOT NULL, statusID int(10) unsigned NOT NULL, changed datetime NOT NULL, UNIQUE KEY retailerID (retailerID, statusID, changed) ); INSERT INTO t1 VALUES("0026", "1", "2005-12-06 12:18:56"); INSERT INTO t1 VALUES("0026", "2", "2006-01-06 12:25:53"); INSERT INTO t1 VALUES("0037", "1", "2005-12-06 12:18:56"); INSERT INTO t1 VALUES("0037", "2", "2006-01-06 12:25:53"); INSERT INTO t1 VALUES("0048", "1", "2006-01-06 12:37:50"); INSERT INTO t1 VALUES("0059", "1", "2006-01-06 12:37:50"); select * from t1 r1 where (r1.retailerID,(r1.changed)) in (SELECT r2.retailerId,(max(changed)) from t1 r2 group by r2.retailerId); retailerID statusID changed 0026 2 2006-01-06 12:25:53 0037 2 2006-01-06 12:25:53 0048 1 2006-01-06 12:37:50 0059 1 2006-01-06 12:37:50 drop table t1; create table t1(a int, primary key (a)); insert into t1 values (10); create table t2 (a int primary key, b varchar(32), c int, unique key b(c, b)); insert into t2(a, c, b) values (1,10,'359'), (2,10,'35988'), (3,10,'35989'); explain SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system PRIMARY NULL NULL NULL 1 NULL 1 PRIMARY r const PRIMARY PRIMARY 4 const 1 NULL 2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using index condition SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10; a a b 10 3 35989 explain SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system PRIMARY NULL NULL NULL 1 NULL 1 PRIMARY r const PRIMARY PRIMARY 4 const 1 NULL 2 DEPENDENT SUBQUERY t2 range b b 40 NULL 2 Using index condition SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10; a a b 10 1 359 drop table t1,t2; CREATE TABLE t1 ( field1 int NOT NULL, field2 int NOT NULL, field3 int NOT NULL, PRIMARY KEY (field1,field2,field3) ); CREATE TABLE t2 ( fieldA int NOT NULL, fieldB int NOT NULL, PRIMARY KEY (fieldA,fieldB) ); INSERT INTO t1 VALUES (1,1,1), (1,1,2), (1,2,1), (1,2,2), (1,2,3), (1,3,1); INSERT INTO t2 VALUES (1,1), (1,2), (1,3); SELECT field1, field2, COUNT(*) FROM t1 GROUP BY field1, field2; field1 field2 COUNT(*) 1 1 2 1 2 3 1 3 1 SELECT field1, field2 FROM t1 GROUP BY field1, field2 HAVING COUNT(*) >= ALL (SELECT fieldB FROM t2 WHERE fieldA = field1); field1 field2 1 2 SELECT field1, field2 FROM t1 GROUP BY field1, field2 HAVING COUNT(*) < ANY (SELECT fieldB FROM t2 WHERE fieldA = field1); field1 field2 1 1 1 3 DROP TABLE t1, t2; CREATE TABLE t1(a int, INDEX (a)); INSERT INTO t1 VALUES (1), (3), (5), (7); INSERT INTO t1 VALUES (NULL); CREATE TABLE t2(a int); INSERT INTO t2 VALUES (1),(2),(3); EXPLAIN SELECT a, a IN (SELECT a FROM t1) FROM t2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 3 NULL 2 SUBQUERY t1 index a a 5 NULL 5 Using index SELECT a, a IN (SELECT a FROM t1) FROM t2; a a IN (SELECT a FROM t1) 1 1 2 NULL 3 1 DROP TABLE t1,t2; CREATE TABLE t1 (a DATETIME); INSERT INTO t1 VALUES ('1998-09-23'), ('2003-03-25'); CREATE TABLE t2 AS SELECT (SELECT a FROM t1 WHERE a < '2000-01-01') AS sub_a FROM t1 WHERE a > '2000-01-01'; SHOW CREATE TABLE t2; Table Create Table t2 CREATE TABLE `t2` ( `sub_a` datetime DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 CREATE TABLE t3 AS (SELECT a FROM t1 WHERE a < '2000-01-01') UNION (SELECT a FROM t1 WHERE a > '2000-01-01'); SHOW CREATE TABLE t3; Table Create Table t3 CREATE TABLE `t3` ( `a` datetime DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 DROP TABLE t1,t2,t3; CREATE TABLE t1 (a int); INSERT INTO t1 VALUES (1), (2); SELECT a FROM t1 WHERE (SELECT 1 FROM DUAL WHERE 1=0) > 0; a SELECT a FROM t1 WHERE (SELECT 1 FROM DUAL WHERE 1=0) IS NULL; a 1 2 EXPLAIN SELECT a FROM t1 WHERE (SELECT 1 FROM DUAL WHERE 1=0) IS NULL; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 NULL 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE DROP TABLE t1; CREATE TABLE t1 (a int); INSERT INTO t1 VALUES (2), (4), (1), (3); CREATE TABLE t2 (b int, c int); INSERT INTO t2 VALUES (2,1), (1,3), (2,1), (4,4), (2,2), (1,4); SELECT a FROM t1 ORDER BY (SELECT c FROM t2 WHERE b > 2 ); a 2 4 1 3 SELECT a FROM t1 ORDER BY (SELECT c FROM t2 WHERE b > 1); ERROR 21000: Subquery returns more than 1 row SELECT a FROM t1 ORDER BY (SELECT c FROM t2 WHERE b > 2), a; a 1 2 3 4 SELECT a FROM t1 ORDER BY (SELECT c FROM t2 WHERE b > 1), a; ERROR 21000: Subquery returns more than 1 row SELECT b, MAX(c) FROM t2 GROUP BY b, (SELECT c FROM t2 WHERE b > 2); b MAX(c) 1 4 2 2 4 4 SELECT b, MAX(c) FROM t2 GROUP BY b, (SELECT c FROM t2 WHERE b > 1); ERROR 21000: Subquery returns more than 1 row SELECT a FROM t1 GROUP BY a HAVING IFNULL((SELECT b FROM t2 WHERE b > 2), (SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b)) > 3; a 1 2 3 4 SELECT a FROM t1 GROUP BY a HAVING IFNULL((SELECT b FROM t2 WHERE b > 1), (SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b)) > 3; ERROR 21000: Subquery returns more than 1 row SELECT a FROM t1 GROUP BY a HAVING IFNULL((SELECT b FROM t2 WHERE b > 4), (SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b)) > 3; a 4 SELECT a FROM t1 GROUP BY a HAVING IFNULL((SELECT b FROM t2 WHERE b > 4), (SELECT c FROM t2 WHERE c=a AND b > 1 ORDER BY b)) > 3; ERROR 21000: Subquery returns more than 1 row SELECT a FROM t1 ORDER BY IFNULL((SELECT b FROM t2 WHERE b > 2), (SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b)); a 2 4 1 3 SELECT a FROM t1 ORDER BY IFNULL((SELECT b FROM t2 WHERE b > 1), (SELECT c FROM t2 WHERE c=a AND b > 1 ORDER BY b)); ERROR 21000: Subquery returns more than 1 row SELECT a FROM t1 ORDER BY IFNULL((SELECT b FROM t2 WHERE b > 4), (SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b)); a 2 1 3 4 SELECT a FROM t1 ORDER BY IFNULL((SELECT b FROM t2 WHERE b > 4), (SELECT c FROM t2 WHERE c=a AND b > 1 ORDER BY b)); ERROR 21000: Subquery returns more than 1 row DROP TABLE t1,t2; create table t1 (df decimal(5,1)); insert into t1 values(1.1); insert into t1 values(2.2); select * from t1 where df <= all (select avg(df) from t1 group by df); df 1.1 select * from t1 where df >= all (select avg(df) from t1 group by df); df 2.2 drop table t1; create table t1 (df decimal(5,1)); insert into t1 values(1.1); select 1.1 * exists(select * from t1); 1.1 * exists(select * from t1) 1.1 drop table t1; CREATE TABLE t1 ( grp int(11) default NULL, a decimal(10,2) default NULL); insert into t1 values (1, 1), (2, 2), (2, 3), (3, 4), (3, 5), (3, 6), (NULL, NULL); select * from t1; grp a 1 1.00 2 2.00 2 3.00 3 4.00 3 5.00 3 6.00 NULL NULL select min(a) from t1 group by grp; min(a) NULL 1.00 2.00 4.00 drop table t1; CREATE table t1 ( c1 integer ); INSERT INTO t1 VALUES ( 1 ); INSERT INTO t1 VALUES ( 2 ); INSERT INTO t1 VALUES ( 3 ); CREATE TABLE t2 ( c2 integer ); INSERT INTO t2 VALUES ( 1 ); INSERT INTO t2 VALUES ( 4 ); INSERT INTO t2 VALUES ( 5 ); SELECT * FROM t1 LEFT JOIN t2 ON c1 = c2 WHERE c2 IN (1); c1 c2 1 1 SELECT * FROM t1 LEFT JOIN t2 ON c1 = c2 WHERE c2 IN ( SELECT c2 FROM t2 WHERE c2 IN ( 1 ) ); c1 c2 1 1 DROP TABLE t1,t2; CREATE TABLE t1 ( c1 integer ); INSERT INTO t1 VALUES ( 1 ); INSERT INTO t1 VALUES ( 2 ); INSERT INTO t1 VALUES ( 3 ); INSERT INTO t1 VALUES ( 6 ); CREATE TABLE t2 ( c2 integer ); INSERT INTO t2 VALUES ( 1 ); INSERT INTO t2 VALUES ( 4 ); INSERT INTO t2 VALUES ( 5 ); INSERT INTO t2 VALUES ( 6 ); CREATE TABLE t3 ( c3 integer ); INSERT INTO t3 VALUES ( 7 ); INSERT INTO t3 VALUES ( 8 ); SELECT c1,c2 FROM t1 LEFT JOIN t2 ON c1 = c2 WHERE EXISTS (SELECT c3 FROM t3 WHERE c2 IS NULL ); c1 c2 2 NULL 3 NULL DROP TABLE t1,t2,t3; CREATE TABLE `t1` ( `itemid` bigint(20) unsigned NOT NULL auto_increment, `sessionid` bigint(20) unsigned default NULL, `time` int(10) unsigned NOT NULL default '0', `type` set('A','D','E','F','G','I','L','N','U') collate latin1_general_ci NOT NULL default '', `data` text collate latin1_general_ci NOT NULL, PRIMARY KEY (`itemid`) ) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci; INSERT INTO `t1` VALUES (1, 1, 1, 'D', ''); CREATE TABLE `t2` ( `sessionid` bigint(20) unsigned NOT NULL auto_increment, `pid` int(10) unsigned NOT NULL default '0', `date` int(10) unsigned NOT NULL default '0', `ip` varchar(15) collate latin1_general_ci NOT NULL default '', PRIMARY KEY (`sessionid`) ) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci; INSERT INTO `t2` VALUES (1, 1, 1, '10.10.10.1'); SELECT s.ip, count( e.itemid ) FROM `t1` e JOIN t2 s ON s.sessionid = e.sessionid WHERE e.sessionid = ( SELECT sessionid FROM t2 ORDER BY sessionid DESC LIMIT 1 ) GROUP BY s.ip HAVING count( e.itemid ) >0 LIMIT 0 , 30; ip count( e.itemid ) 10.10.10.1 1 drop tables t1,t2; CREATE TABLE t1 (EMPNUM CHAR(3)); CREATE TABLE t2 (EMPNUM CHAR(3) ); INSERT INTO t1 VALUES ('E1'),('E2'); INSERT INTO t2 VALUES ('E1'); DELETE FROM t1 WHERE t1.EMPNUM NOT IN (SELECT t2.EMPNUM FROM t2 WHERE t1.EMPNUM = t2.EMPNUM); select * from t1; EMPNUM E1 DROP TABLE t1,t2; CREATE TABLE t1(select_id BIGINT, values_id BIGINT); INSERT INTO t1 VALUES (1, 1); CREATE TABLE t2 (select_id BIGINT, values_id BIGINT, PRIMARY KEY(select_id,values_id)); INSERT INTO t2 VALUES (0, 1), (0, 2), (0, 3), (1, 5); SELECT values_id FROM t1 WHERE values_id IN (SELECT values_id FROM t2 WHERE select_id IN (1, 0)); values_id 1 SELECT values_id FROM t1 WHERE values_id IN (SELECT values_id FROM t2 WHERE select_id BETWEEN 0 AND 1); values_id 1 SELECT values_id FROM t1 WHERE values_id IN (SELECT values_id FROM t2 WHERE select_id = 0 OR select_id = 1); values_id 1 DROP TABLE t1, t2; create table t1 (fld enum('0','1')); insert into t1 values ('1'); select * from (select max(fld) from t1) as foo; max(fld) 1 drop table t1; CREATE TABLE t1 (a int, b int); CREATE TABLE t2 (c int, d int); CREATE TABLE t3 (e int); INSERT INTO t1 VALUES (1,10), (2,10), (1,20), (2,20), (3,20), (2,30), (4,40); INSERT INTO t2 VALUES (2,10), (2,20), (4,10), (5,10), (3,20), (2,40); INSERT INTO t3 VALUES (10), (30), (10), (20) ; SELECT a, MAX(b), MIN(b) FROM t1 GROUP BY a; a MAX(b) MIN(b) 1 20 10 2 30 10 3 20 20 4 40 40 SELECT * FROM t2; c d 2 10 2 20 4 10 5 10 3 20 2 40 SELECT * FROM t3; e 10 30 10 20 SELECT a FROM t1 GROUP BY a HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20); a 2 4 SELECT a FROM t1 GROUP BY a HAVING a IN (SELECT c FROM t2 WHERE MAX(b)<d); a 2 SELECT a FROM t1 GROUP BY a HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>d); a 2 4 SELECT a FROM t1 GROUP BY a HAVING a IN (SELECT c FROM t2 WHERE d >= SOME(SELECT e FROM t3 WHERE MAX(b)=e)); a 2 3 SELECT a FROM t1 GROUP BY a HAVING a IN (SELECT c FROM t2 WHERE EXISTS(SELECT e FROM t3 WHERE MAX(b)=e AND e <= d)); a 2 3 SELECT a FROM t1 GROUP BY a HAVING a IN (SELECT c FROM t2 WHERE d > SOME(SELECT e FROM t3 WHERE MAX(b)=e)); a 2 SELECT a FROM t1 GROUP BY a HAVING a IN (SELECT c FROM t2 WHERE EXISTS(SELECT e FROM t3 WHERE MAX(b)=e AND e < d)); a 2 SELECT a FROM t1 GROUP BY a HAVING a IN (SELECT c FROM t2 WHERE MIN(b) < d AND EXISTS(SELECT e FROM t3 WHERE MAX(b)=e AND e <= d)); a 2 SELECT a, SUM(a) FROM t1 GROUP BY a; a SUM(a) 1 2 2 6 3 3 4 4 SELECT a FROM t1 WHERE EXISTS(SELECT c FROM t2 GROUP BY c HAVING SUM(a) = c) GROUP BY a; a 3 4 SELECT a FROM t1 GROUP BY a HAVING EXISTS(SELECT c FROM t2 GROUP BY c HAVING SUM(a) = c); a 1 3 4 SELECT a FROM t1 WHERE a < 3 AND EXISTS(SELECT c FROM t2 GROUP BY c HAVING SUM(a) != c) GROUP BY a; a 1 2 SELECT a FROM t1 WHERE a < 3 AND EXISTS(SELECT c FROM t2 GROUP BY c HAVING SUM(a) != c); a 1 2 1 2 2 SELECT t1.a FROM t1 GROUP BY t1.a HAVING t1.a < ALL(SELECT t2.c FROM t2 GROUP BY t2.c HAVING EXISTS(SELECT t3.e FROM t3 GROUP BY t3.e HAVING SUM(t1.a+t2.c) < t3.e/4)); a 1 2 SELECT t1.a FROM t1 GROUP BY t1.a HAVING t1.a > ALL(SELECT t2.c FROM t2 WHERE EXISTS(SELECT t3.e FROM t3 GROUP BY t3.e HAVING SUM(t1.a+t2.c) < t3.e/4)); a 4 SELECT t1.a FROM t1 GROUP BY t1.a HAVING t1.a > ALL(SELECT t2.c FROM t2 WHERE EXISTS(SELECT t3.e FROM t3 WHERE SUM(t1.a+t2.c) < t3.e/4)); ERROR HY000: Invalid use of group function SELECT t1.a from t1 GROUP BY t1.a HAVING AVG(SUM(t1.b)) > 20; ERROR HY000: Invalid use of group function SELECT t1.a FROM t1 GROUP BY t1.a HAVING t1.a IN (SELECT t2.c FROM t2 GROUP BY t2.c HAVING AVG(t2.c+SUM(t1.b)) > 20); a 2 3 4 SELECT t1.a FROM t1 GROUP BY t1.a HAVING t1.a IN (SELECT t2.c FROM t2 GROUP BY t2.c HAVING AVG(SUM(t1.b)) > 20); a 2 4 SELECT t1.a, SUM(b) AS sum FROM t1 GROUP BY t1.a HAVING t1.a IN (SELECT t2.c FROM t2 GROUP BY t2.c HAVING t2.c+sum > 20); a sum 2 60 3 20 4 40 DROP TABLE t1,t2,t3; create table t1( f1 int,f2 int); insert into t1 values (1,1),(2,2); select tt.t from (select 'crash1' as t, f2 from t1) as tt left join t1 on tt.t = 'crash2' and tt.f2 = t1.f2 where tt.t = 'crash1'; t crash1 crash1 drop table t1; create table t1 (c int, key(c)); insert into t1 values (1142477582), (1142455969); create table t2 (a int, b int); insert into t2 values (2, 1), (1, 0); delete from t1 where c <= 1140006215 and (select b from t2 where a = 2) = 1; drop table t1, t2; CREATE TABLE t1 (a INT); CREATE VIEW v1 AS SELECT * FROM t1 WHERE no_such_column = ANY (SELECT 1); ERROR 42S22: Unknown column 'no_such_column' in 'where clause' CREATE VIEW v2 AS SELECT * FROM t1 WHERE no_such_column = (SELECT 1); ERROR 42S22: Unknown column 'no_such_column' in 'where clause' SELECT * FROM t1 WHERE no_such_column = ANY (SELECT 1); ERROR 42S22: Unknown column 'no_such_column' in 'IN/ALL/ANY subquery' DROP TABLE t1; create table t1 (i int, j bigint); insert into t1 values (1, 2), (2, 2), (3, 2); select * from (select min(i) from t1 where j=(select * from (select min(j) from t1) t2)) t3; min(i) 1 drop table t1; CREATE TABLE t1 (i BIGINT UNSIGNED); INSERT INTO t1 VALUES (10000000000000000000); INSERT INTO t1 VALUES (1); CREATE TABLE t2 (i BIGINT UNSIGNED); INSERT INTO t2 VALUES (10000000000000000000); INSERT INTO t2 VALUES (1); /* simple test */ SELECT t1.i FROM t1 JOIN t2 ON t1.i = t2.i; i 10000000000000000000 1 /* subquery test */ SELECT t1.i FROM t1 WHERE t1.i = (SELECT MAX(i) FROM t2); i 10000000000000000000 /* subquery test with cast*/ SELECT t1.i FROM t1 WHERE t1.i = CAST((SELECT MAX(i) FROM t2) AS UNSIGNED); i 10000000000000000000 DROP TABLE t1; DROP TABLE t2; CREATE TABLE t1 ( id bigint(20) unsigned NOT NULL auto_increment, name varchar(255) NOT NULL, PRIMARY KEY (id) ); INSERT INTO t1 VALUES (1, 'Balazs'), (2, 'Joe'), (3, 'Frank'); CREATE TABLE t2 ( id bigint(20) unsigned NOT NULL auto_increment, mid bigint(20) unsigned NOT NULL, date date NOT NULL, PRIMARY KEY (id) ); INSERT INTO t2 VALUES (1, 1, '2006-03-30'), (2, 2, '2006-04-06'), (3, 3, '2006-04-13'), (4, 2, '2006-04-20'), (5, 1, '2006-05-01'); SELECT *, (SELECT date FROM t2 WHERE mid = t1.id ORDER BY date DESC LIMIT 0, 1) AS date_last, (SELECT date FROM t2 WHERE mid = t1.id ORDER BY date DESC LIMIT 3, 1) AS date_next_to_last FROM t1; id name date_last date_next_to_last 1 Balazs 2006-05-01 NULL 2 Joe 2006-04-20 NULL 3 Frank 2006-04-13 NULL SELECT *, (SELECT COUNT(*) FROM t2 WHERE mid = t1.id ORDER BY date DESC LIMIT 1, 1) AS date_count FROM t1; id name date_count 1 Balazs NULL 2 Joe NULL 3 Frank NULL SELECT *, (SELECT date FROM t2 WHERE mid = t1.id ORDER BY date DESC LIMIT 0, 1) AS date_last, (SELECT date FROM t2 WHERE mid = t1.id ORDER BY date DESC LIMIT 1, 1) AS date_next_to_last FROM t1; id name date_last date_next_to_last 1 Balazs 2006-05-01 2006-03-30 2 Joe 2006-04-20 2006-04-06 3 Frank 2006-04-13 NULL DROP TABLE t1,t2; CREATE TABLE t1 ( i1 int(11) NOT NULL default '0', i2 int(11) NOT NULL default '0', t datetime NOT NULL default '0000-00-00 00:00:00', PRIMARY KEY (i1,i2,t) ); INSERT INTO t1 VALUES (24,1,'2005-03-03 16:31:31'),(24,1,'2005-05-27 12:40:07'), (24,1,'2005-05-27 12:40:08'),(24,1,'2005-05-27 12:40:10'), (24,1,'2005-05-27 12:40:25'),(24,1,'2005-05-27 12:40:30'), (24,2,'2005-03-03 13:43:05'),(24,2,'2005-03-03 16:23:31'), (24,2,'2005-03-03 16:31:30'),(24,2,'2005-05-27 12:37:02'), (24,2,'2005-05-27 12:40:06'); CREATE TABLE t2 ( i1 int(11) NOT NULL default '0', i2 int(11) NOT NULL default '0', t datetime default NULL, PRIMARY KEY (i1) ); INSERT INTO t2 VALUES (24,1,'2006-06-20 12:29:40'); EXPLAIN SELECT * FROM t1,t2 WHERE t1.t = (SELECT t1.t FROM t1 WHERE t1.t < t2.t AND t1.i2=1 AND t2.i1=t1.i1 ORDER BY t1.t DESC LIMIT 1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 system NULL NULL NULL NULL 1 NULL 1 PRIMARY t1 index NULL PRIMARY 13 NULL 11 Using where; Using index 2 DEPENDENT SUBQUERY t1 range PRIMARY PRIMARY 13 NULL 5 Using where; Using index SELECT * FROM t1,t2 WHERE t1.t = (SELECT t1.t FROM t1 WHERE t1.t < t2.t AND t1.i2=1 AND t2.i1=t1.i1 ORDER BY t1.t DESC LIMIT 1); i1 i2 t i1 i2 t 24 1 2005-05-27 12:40:30 24 1 2006-06-20 12:29:40 DROP TABLE t1, t2; CREATE TABLE t1 (i INT); (SELECT i FROM t1) UNION (SELECT i FROM t1); i SELECT sql_no_cache * FROM t1 WHERE NOT EXISTS ( (SELECT i FROM t1) UNION (SELECT i FROM t1) ); i SELECT * FROM t1 WHERE NOT EXISTS (((SELECT i FROM t1) UNION (SELECT i FROM t1))); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION (SELECT i FROM t1)))' at line 2 explain select ((select t11.i from t1 t11) union (select t12.i from t1 t12)) from t1; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union (select t12.i from t1 t12)) from t1' at line 1 explain select * from t1 where not exists ((select t11.i from t1 t11) union (select t12.i from t1 t12)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table 3 UNION NULL NULL NULL NULL NULL NULL NULL no matching row in const table NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL Using temporary DROP TABLE t1; CREATE TABLE t1 (a VARCHAR(250), b INT auto_increment, PRIMARY KEY (b)); insert into t1 (a) values (FLOOR(rand() * 100)); insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; insert into t1 (a) select FLOOR(rand() * 100) from t1; SELECT a, (SELECT REPEAT(' ',250) FROM t1 i1 WHERE i1.b=t1.a ORDER BY RAND() LIMIT 1) AS a FROM t1 ORDER BY a LIMIT 5; a a 0 NULL 0 NULL 0 NULL 0 NULL 0 NULL DROP TABLE t1; CREATE TABLE t1 (a INT, b INT); CREATE TABLE t2 (a INT); INSERT INTO t2 values (1); INSERT INTO t1 VALUES (1,1),(1,2),(2,3),(3,4); SELECT (SELECT COUNT(DISTINCT t1.b) from t2) FROM t1 GROUP BY t1.a; (SELECT COUNT(DISTINCT t1.b) from t2) 2 1 1 SELECT (SELECT COUNT(DISTINCT t1.b) from t2 union select 1 from t2 where 12 < 3) FROM t1 GROUP BY t1.a; (SELECT COUNT(DISTINCT t1.b) from t2 union select 1 from t2 where 12 < 3) 2 1 1 SELECT COUNT(DISTINCT t1.b), (SELECT COUNT(DISTINCT t1.b)) FROM t1 GROUP BY t1.a; COUNT(DISTINCT t1.b) (SELECT COUNT(DISTINCT t1.b)) 2 2 1 1 1 1 SELECT COUNT(DISTINCT t1.b), (SELECT COUNT(DISTINCT t1.b) union select 1 from DUAL where 12 < 3) FROM t1 GROUP BY t1.a; COUNT(DISTINCT t1.b) (SELECT COUNT(DISTINCT t1.b) union select 1 from DUAL where 12 < 3) 2 2 1 1 1 1 SELECT ( SELECT ( SELECT COUNT(DISTINCT t1.b) ) ) FROM t1 GROUP BY t1.a; ( SELECT ( SELECT COUNT(DISTINCT t1.b) ) ) 2 1 1 SELECT ( SELECT ( SELECT ( SELECT COUNT(DISTINCT t1.b) ) ) FROM t1 GROUP BY t1.a LIMIT 1) FROM t1 t2 GROUP BY t2.a; ( SELECT ( SELECT ( SELECT COUNT(DISTINCT t1.b) ) ) FROM t1 GROUP BY t1.a LIMIT 1) 2 2 2 DROP TABLE t1,t2; CREATE TABLE t1 (a int, b int, PRIMARY KEY (b)); CREATE TABLE t2 (x int auto_increment, y int, z int, PRIMARY KEY (x), FOREIGN KEY (y) REFERENCES t1 (b)); create table t3 (a int); insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); insert into t1 select RAND()*1000, A.a + 10*(B.a+10*(C.a+10*D.a)) from t3 A, t3 B, t3 C, t3 D where D.a<3; insert into t2(y,z) select t1.b, RAND()*1000 from t1, t3; SET SESSION sort_buffer_size = 32 * 1024; SELECT SQL_NO_CACHE COUNT(*) FROM (SELECT a, b, (SELECT x FROM t2 WHERE y=b ORDER BY z DESC LIMIT 1) c FROM t1) t; COUNT(*) 3000 SET SESSION sort_buffer_size = 8 * 1024 * 1024; SELECT SQL_NO_CACHE COUNT(*) FROM (SELECT a, b, (SELECT x FROM t2 WHERE y=b ORDER BY z DESC LIMIT 1) c FROM t1) t; COUNT(*) 3000 DROP TABLE t1,t2,t3; CREATE TABLE t1 (id char(4) PRIMARY KEY, c int); CREATE TABLE t2 (c int); INSERT INTO t1 VALUES ('aa', 1); INSERT INTO t2 VALUES (1); SELECT * FROM t1 WHERE EXISTS (SELECT c FROM t2 WHERE c=1 UNION SELECT c from t2 WHERE c=t1.c); id c aa 1 INSERT INTO t1 VALUES ('bb', 2), ('cc', 3), ('dd',1); SELECT * FROM t1 WHERE EXISTS (SELECT c FROM t2 WHERE c=1 UNION SELECT c from t2 WHERE c=t1.c); id c aa 1 bb 2 cc 3 dd 1 INSERT INTO t2 VALUES (2); CREATE TABLE t3 (c int); INSERT INTO t3 VALUES (1); SELECT * FROM t1 WHERE EXISTS (SELECT t2.c FROM t2 JOIN t3 ON t2.c=t3.c WHERE t2.c=1 UNION SELECT c from t2 WHERE c=t1.c); id c aa 1 bb 2 cc 3 dd 1 DROP TABLE t1,t2,t3; CREATE TABLE t1(f1 int); CREATE TABLE t2(f2 int, f21 int, f3 timestamp); INSERT INTO t1 VALUES (1),(1),(2),(2); INSERT INTO t2 VALUES (1,1,"2004-02-29 11:11:11"), (2,2,"2004-02-29 11:11:11"); SELECT ((SELECT f2 FROM t2 WHERE f21=f1 LIMIT 1) * COUNT(f1)) AS sq FROM t1 GROUP BY f1; sq 2 4 SELECT (SELECT SUM(1) FROM t2 ttt GROUP BY t2.f3 LIMIT 1) AS tt FROM t2; tt 2 2 PREPARE stmt1 FROM 'SELECT ((SELECT f2 FROM t2 WHERE f21=f1 LIMIT 1) * COUNT(f1)) AS sq FROM t1 GROUP BY f1'; EXECUTE stmt1; sq 2 4 EXECUTE stmt1; sq 2 4 DEALLOCATE PREPARE stmt1; SELECT f2, AVG(f21), (SELECT t.f3 FROM t2 AS t WHERE t2.f2=t.f2 AND t.f3=MAX(t2.f3)) AS test FROM t2 GROUP BY f2; f2 AVG(f21) test 1 1.0000 2004-02-29 11:11:11 2 2.0000 2004-02-29 11:11:11 DROP TABLE t1,t2; CREATE TABLE t1 (a int, b INT, c CHAR(10) NOT NULL); INSERT INTO t1 VALUES (1,1,'a'), (1,2,'b'), (1,3,'c'), (1,4,'d'), (1,5,'e'), (2,1,'f'), (2,2,'g'), (2,3,'h'), (3,4,'i'), (3,3,'j'), (3,2,'k'), (3,1,'l'), (1,9,'m'); SELECT a, MAX(b), (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b)) AS test FROM t1 GROUP BY a; a MAX(b) test 1 9 m 2 3 h 3 4 i DROP TABLE t1; DROP TABLE IF EXISTS t1; DROP TABLE IF EXISTS t2; DROP TABLE IF EXISTS t1xt2; CREATE TABLE t1 ( id_1 int(5) NOT NULL, t varchar(4) DEFAULT NULL ); CREATE TABLE t2 ( id_2 int(5) NOT NULL, t varchar(4) DEFAULT NULL ); CREATE TABLE t1xt2 ( id_1 int(5) NOT NULL, id_2 int(5) NOT NULL ); INSERT INTO t1 VALUES (1, 'a'), (2, 'b'), (3, 'c'), (4, 'd'); INSERT INTO t2 VALUES (2, 'bb'), (3, 'cc'), (4, 'dd'), (12, 'aa'); INSERT INTO t1xt2 VALUES (2, 2), (3, 3), (4, 4); SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)); id_1 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))); id_1 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)))); id_1 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)); id_1 1 2 3 4 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN ((SELECT t1xt2.id_2 FROM t1xt2 where t1.id_1 = t1xt2.id_1))); id_1 1 2 3 4 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN (((SELECT t1xt2.id_2 FROM t1xt2 where t1.id_1 = t1xt2.id_1)))); id_1 1 2 3 4 insert INTO t1xt2 VALUES (1, 12); SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)); id_1 1 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))); id_1 1 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)))); id_1 1 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)); id_1 2 3 4 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))); id_1 2 3 4 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)))); id_1 2 3 4 insert INTO t1xt2 VALUES (2, 12); SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)); id_1 1 2 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))); id_1 1 2 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)))); id_1 1 2 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)); id_1 3 4 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))); id_1 3 4 SELECT DISTINCT t1.id_1 FROM t1 WHERE (12 NOT IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)))); id_1 3 4 DROP TABLE t1; DROP TABLE t2; DROP TABLE t1xt2; CREATE TABLE t1 (a int); INSERT INTO t1 VALUES (3), (1), (2); SELECT 'this is ' 'a test.' AS col1, a AS col2 FROM t1; col1 col2 this is a test. 3 this is a test. 1 this is a test. 2 SELECT * FROM (SELECT 'this is ' 'a test.' AS col1, a AS t2 FROM t1) t; col1 t2 this is a test. 3 this is a test. 1 this is a test. 2 DROP table t1; CREATE TABLE t1 (a int, b int); CREATE TABLE t2 (m int, n int); INSERT INTO t1 VALUES (2,2), (2,2), (3,3), (3,3), (3,3), (4,4); INSERT INTO t2 VALUES (1,11), (2,22), (3,32), (4,44), (4,44); SELECT COUNT(*), a, (SELECT m FROM t2 WHERE m = count(*) LIMIT 1) FROM t1 GROUP BY a; COUNT(*) a (SELECT m FROM t2 WHERE m = count(*) LIMIT 1) 2 2 2 3 3 3 1 4 1 SELECT COUNT(*), a, (SELECT MIN(m) FROM t2 WHERE m = count(*)) FROM t1 GROUP BY a; COUNT(*) a (SELECT MIN(m) FROM t2 WHERE m = count(*)) 2 2 2 3 3 3 1 4 1 SELECT COUNT(*), a FROM t1 GROUP BY a HAVING (SELECT MIN(m) FROM t2 WHERE m = count(*)) > 1; COUNT(*) a 2 2 3 3 DROP TABLE t1,t2; CREATE TABLE t1 (a int, b int); CREATE TABLE t2 (m int, n int); INSERT INTO t1 VALUES (2,2), (2,2), (3,3), (3,3), (3,3), (4,4); INSERT INTO t2 VALUES (1,11), (2,22), (3,32), (4,44), (4,44); SELECT COUNT(*) c, a, (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) FROM t1 GROUP BY a; c a (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) 2 2 2 3 3 3 1 4 1,1 SELECT COUNT(*) c, a, (SELECT GROUP_CONCAT(COUNT(a)+1) FROM t2 WHERE m = a) FROM t1 GROUP BY a; c a (SELECT GROUP_CONCAT(COUNT(a)+1) FROM t2 WHERE m = a) 2 2 3 3 3 4 1 4 2,2 DROP table t1,t2; CREATE TABLE t1 (a int, b INT, d INT, c CHAR(10) NOT NULL, PRIMARY KEY (a, b)); INSERT INTO t1 VALUES (1,1,0,'a'), (1,2,0,'b'), (1,3,0,'c'), (1,4,0,'d'), (1,5,0,'e'), (2,1,0,'f'), (2,2,0,'g'), (2,3,0,'h'), (3,4,0,'i'), (3,3,0,'j'), (3,2,0,'k'), (3,1,0,'l'), (1,9,0,'m'), (1,0,10,'n'), (2,0,5,'o'), (3,0,7,'p'); SELECT a, MAX(b), (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b + 0)) as test FROM t1 GROUP BY a; a MAX(b) test 1 9 m 2 3 h 3 4 i SELECT a x, MAX(b), (SELECT t.c FROM t1 AS t WHERE x=t.a AND t.b=MAX(t1.b + 0)) as test FROM t1 GROUP BY a; x MAX(b) test 1 9 m 2 3 h 3 4 i SELECT a, AVG(b), (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=AVG(t1.b)) AS test FROM t1 WHERE t1.d=0 GROUP BY a; a AVG(b) test 1 4.0000 d 2 2.0000 g 3 2.5000 NULL SELECT tt.a, (SELECT (SELECT c FROM t1 as t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a) LIMIT 1) FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test FROM t1 as tt; a test 1 n 1 n 1 n 1 n 1 n 1 n 1 n 2 o 2 o 2 o 2 o 3 p 3 p 3 p 3 p 3 p SELECT tt.a, (SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a) LIMIT 1) FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test FROM t1 as tt GROUP BY tt.a; a test 1 n 2 o 3 p SELECT tt.a, MAX( (SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a) LIMIT 1) FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1)) as test FROM t1 as tt GROUP BY tt.a; a test 1 n 2 o 3 p DROP TABLE t1; CREATE TABLE t1 (a int, b int); INSERT INTO t1 VALUES (2,22),(1,11),(2,22); SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a; a 1 2 SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 1 GROUP BY a; a SELECT a FROM t1 t0 WHERE (SELECT COUNT(t0.b) FROM t1 t WHERE t.b>20) GROUP BY a; a 1 2 SET @@sql_mode='ansi'; SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a; ERROR HY000: Invalid use of group function SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 1 GROUP BY a; ERROR HY000: Invalid use of group function SELECT a FROM t1 t0 WHERE (SELECT COUNT(t0.b) FROM t1 t WHERE t.b>20) GROUP BY a; ERROR HY000: Invalid use of group function SET @@sql_mode=default; DROP TABLE t1; CREATE TABLE t1 (a INT); INSERT INTO t1 values (1),(1),(1),(1); CREATE TABLE t2 (x INT); INSERT INTO t1 values (1000),(1001),(1002); SELECT SUM( (SELECT COUNT(a) FROM t2) ) FROM t1; ERROR HY000: Invalid use of group function SELECT SUM( (SELECT SUM(COUNT(a)) FROM t2) ) FROM t1; ERROR HY000: Invalid use of group function SELECT COUNT(1) FROM DUAL; COUNT(1) 1 SELECT SUM( (SELECT AVG( (SELECT t1.a FROM t2) ) FROM DUAL) ) FROM t1; ERROR HY000: Invalid use of group function SELECT SUM( (SELECT AVG( (SELECT COUNT(*) FROM t1 t HAVING t1.a < 12) ) FROM t2) ) FROM t1; ERROR HY000: Invalid use of group function SELECT t1.a as XXA, SUM( (SELECT AVG( (SELECT COUNT(*) FROM t1 t HAVING XXA < 12) ) FROM t2) ) FROM t1; ERROR HY000: Invalid use of group function DROP TABLE t1,t2; CREATE TABLE t1 (a int, b int, KEY (a)); INSERT INTO t1 VALUES (1,1),(2,1); EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT COUNT(*) FROM t1 GROUP BY b); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ref a a 5 const 1 Using where; Using index 2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort DROP TABLE t1; CREATE TABLE t1 (id int NOT NULL, st CHAR(2), INDEX idx(id)); INSERT INTO t1 VALUES (3,'FL'), (2,'GA'), (4,'FL'), (1,'GA'), (5,'NY'), (7,'FL'), (6,'NY'); CREATE TABLE t2 (id int NOT NULL, INDEX idx(id)); INSERT INTO t2 VALUES (7), (5), (1), (3); SELECT id, st FROM t1 WHERE st IN ('GA','FL') AND EXISTS(SELECT 1 FROM t2 WHERE t2.id=t1.id); id st 3 FL 1 GA 7 FL SELECT id, st FROM t1 WHERE st IN ('GA','FL') AND EXISTS(SELECT 1 FROM t2 WHERE t2.id=t1.id) GROUP BY id; id st 1 GA 3 FL 7 FL SELECT id, st FROM t1 WHERE st IN ('GA','FL') AND NOT EXISTS(SELECT 1 FROM t2 WHERE t2.id=t1.id); id st 2 GA 4 FL SELECT id, st FROM t1 WHERE st IN ('GA','FL') AND NOT EXISTS(SELECT 1 FROM t2 WHERE t2.id=t1.id) GROUP BY id; id st 2 GA 4 FL DROP TABLE t1,t2; CREATE TABLE t1 (a int); INSERT INTO t1 VALUES (1), (2); EXPLAIN EXTENDED SELECT * FROM (SELECT count(*) FROM t1 GROUP BY a) as res; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 100.00 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `res`.`count(*)` AS `count(*)` from (/* select#2 */ select count(0) AS `count(*)` from `test`.`t1` group by `test`.`t1`.`a`) `res` DROP TABLE t1; CREATE TABLE t1 ( a varchar(255) default NULL, b timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, INDEX idx(a,b) ); CREATE TABLE t2 ( a varchar(255) default NULL ); INSERT INTO t1 VALUES ('abcdefghijk','2007-05-07 06:00:24'); INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO `t1` VALUES ('asdf','2007-02-08 01:11:26'); INSERT INTO `t2` VALUES ('abcdefghijk'); INSERT INTO `t2` VALUES ('asdf'); SET session sort_buffer_size=8192; Warnings: Warning 1292 Truncated incorrect sort_buffer_size value: '8192' SELECT (SELECT 1 FROM t1 WHERE t1.a=t2.a ORDER BY t1.b LIMIT 1) AS d1 FROM t2; d1 1 1 DROP TABLE t1,t2; CREATE TABLE t1 (a INTEGER, b INTEGER); CREATE TABLE t2 (x INTEGER); INSERT INTO t1 VALUES (1,11), (2,22), (2,22); INSERT INTO t2 VALUES (1), (2); SELECT a, COUNT(b), (SELECT COUNT(b) FROM t2) FROM t1 GROUP BY a; ERROR 21000: Subquery returns more than 1 row SELECT a, COUNT(b), (SELECT COUNT(b)+0 FROM t2) FROM t1 GROUP BY a; ERROR 21000: Subquery returns more than 1 row SELECT (SELECT SUM(t1.a)/AVG(t2.x) FROM t2) FROM t1; (SELECT SUM(t1.a)/AVG(t2.x) FROM t2) 3.3333 DROP TABLE t1,t2; CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1, 2), (1,3), (1,4), (2,1), (2,2); SELECT a1.a, COUNT(*) FROM t1 a1 WHERE a1.a = 1 AND EXISTS( SELECT a2.a FROM t1 a2 WHERE a2.a = a1.a) GROUP BY a1.a; a COUNT(*) 1 3 DROP TABLE t1; CREATE TABLE t1 (a INT); CREATE TABLE t2 (a INT); INSERT INTO t1 VALUES (1),(2); INSERT INTO t2 VALUES (1),(2); SELECT (SELECT SUM(t1.a) FROM t2 WHERE a=0) FROM t1; (SELECT SUM(t1.a) FROM t2 WHERE a=0) NULL SELECT (SELECT SUM(t1.a) FROM t2 WHERE a!=0) FROM t1; ERROR 21000: Subquery returns more than 1 row SELECT (SELECT SUM(t1.a) FROM t2 WHERE a=1) FROM t1; (SELECT SUM(t1.a) FROM t2 WHERE a=1) 3 DROP TABLE t1,t2; CREATE TABLE t1 (a1 INT, a2 INT); CREATE TABLE t2 (b1 INT, b2 INT); INSERT INTO t1 VALUES (100, 200); INSERT INTO t1 VALUES (101, 201); INSERT INTO t2 VALUES (101, 201); INSERT INTO t2 VALUES (103, 203); SELECT ((a1,a2) IN (SELECT * FROM t2 WHERE b2 > 0)) IS NULL FROM t1; ((a1,a2) IN (SELECT * FROM t2 WHERE b2 > 0)) IS NULL 0 0 DROP TABLE t1, t2; CREATE TABLE t1 (s1 BINARY(5), s2 VARBINARY(5)); INSERT INTO t1 VALUES (0x41,0x41), (0x42,0x42), (0x43,0x43); SELECT s1, s2 FROM t1 WHERE s2 IN (SELECT s1 FROM t1); s1 s2 SELECT s1, s2 FROM t1 WHERE (s2, 10) IN (SELECT s1, 10 FROM t1); s1 s2 CREATE INDEX I1 ON t1 (s1); CREATE INDEX I2 ON t1 (s2); SELECT s1, s2 FROM t1 WHERE s2 IN (SELECT s1 FROM t1); s1 s2 SELECT s1, s2 FROM t1 WHERE (s2, 10) IN (SELECT s1, 10 FROM t1); s1 s2 TRUNCATE t1; INSERT INTO t1 VALUES (0x41,0x41); SELECT * FROM t1 WHERE s1 = (SELECT s2 FROM t1); s1 s2 DROP TABLE t1; CREATE TABLE t1 (a1 VARBINARY(2) NOT NULL DEFAULT '0', PRIMARY KEY (a1)); CREATE TABLE t2 (a2 BINARY(2) default '0', INDEX (a2)); CREATE TABLE t3 (a3 BINARY(2) default '0'); INSERT INTO t1 VALUES (1),(2),(3),(4); INSERT INTO t2 VALUES (1),(2),(3); INSERT INTO t3 VALUES (1),(2),(3); SELECT LEFT(t2.a2, 1) FROM t2,t3 WHERE t3.a3=t2.a2; LEFT(t2.a2, 1) 1 2 3 SELECT t1.a1, t1.a1 in (SELECT t2.a2 FROM t2,t3 WHERE t3.a3=t2.a2) FROM t1; a1 t1.a1 in (SELECT t2.a2 FROM t2,t3 WHERE t3.a3=t2.a2) 1 0 2 0 3 0 4 0 DROP TABLE t1,t2,t3; CREATE TABLE t1 (a1 BINARY(3) PRIMARY KEY, b1 VARBINARY(3)); CREATE TABLE t2 (a2 VARBINARY(3) PRIMARY KEY); CREATE TABLE t3 (a3 VARBINARY(3) PRIMARY KEY); INSERT INTO t1 VALUES (1,10), (2,20), (3,30), (4,40); INSERT INTO t2 VALUES (2), (3), (4), (5); INSERT INTO t3 VALUES (10), (20), (30); SELECT LEFT(t1.a1,1) FROM t1,t3 WHERE t1.b1=t3.a3; LEFT(t1.a1,1) 1 2 3 SELECT a2 FROM t2 WHERE t2.a2 IN (SELECT t1.a1 FROM t1,t3 WHERE t1.b1=t3.a3); a2 DROP TABLE t1, t2, t3; CREATE TABLE t1(a INT, b INT); INSERT INTO t1 VALUES (1,1), (1,2), (2,3), (2,4); EXPLAIN SELECT a AS out_a, MIN(b) FROM t1 WHERE b > (SELECT MIN(b) FROM t1 WHERE a = out_a) GROUP BY a; ERROR 42S22: Unknown column 'out_a' in 'where clause' SELECT a AS out_a, MIN(b) FROM t1 WHERE b > (SELECT MIN(b) FROM t1 WHERE a = out_a) GROUP BY a; ERROR 42S22: Unknown column 'out_a' in 'where clause' EXPLAIN SELECT a AS out_a, MIN(b) FROM t1 t1_outer WHERE b > (SELECT MIN(b) FROM t1 WHERE a = t1_outer.a) GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1_outer ALL NULL NULL NULL NULL 4 Using where; Using temporary; Using filesort 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 4 Using where SELECT a AS out_a, MIN(b) FROM t1 t1_outer WHERE b > (SELECT MIN(b) FROM t1 WHERE a = t1_outer.a) GROUP BY a; out_a MIN(b) 1 2 2 4 DROP TABLE t1; CREATE TABLE t1 (a INT); CREATE TABLE t2 (a INT); INSERT INTO t1 VALUES (1),(2); INSERT INTO t2 VALUES (1),(2); SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a)); 2 2 2 EXPLAIN EXTENDED SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select 2 AS `2` from `test`.`t1` where exists(/* select#2 */ select 1 from `test`.`t2` where (`test`.`t1`.`a` = `test`.`t2`.`a`)) EXPLAIN EXTENDED SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a) UNION (SELECT 1 FROM t2 WHERE t1.a = t2.a)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where 3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 2 100.00 Using where NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1 Note 1276 Field or reference 'test.t1.a' of SELECT #3 was resolved in SELECT #1 Note 1003 /* select#1 */ select 2 AS `2` from `test`.`t1` where exists((/* select#2 */ select 1 from `test`.`t2` where (`test`.`t1`.`a` = `test`.`t2`.`a`)) union (/* select#3 */ select 1 from `test`.`t2` where (`test`.`t1`.`a` = `test`.`t2`.`a`))) DROP TABLE t1,t2; create table t0(a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1(f11 int, f12 int); create table t2(f21 int unsigned not null, f22 int, f23 varchar(10)); insert into t1 values(1,1),(2,2), (3, 3); insert into t2 select -1 , (@a:=(A.a + 10 * (B.a + 10 * (C.a+10*D.a))))/5000 + 1, @a from t0 A, t0 B, t0 C, t0 D; set session sort_buffer_size= 33*1024; select count(*) from t1 where f12 = (select f22 from t2 where f22 = f12 order by f21 desc, f22, f23 limit 1); count(*) 3 drop table t0,t1,t2; CREATE TABLE t4 ( f7 varchar(32) collate utf8_bin NOT NULL default '', f10 varchar(32) collate utf8_bin default NULL, PRIMARY KEY (f7) ); INSERT INTO t4 VALUES(1,1), (2,null); CREATE TABLE t2 ( f4 varchar(32) collate utf8_bin NOT NULL default '', f2 varchar(50) collate utf8_bin default NULL, f3 varchar(10) collate utf8_bin default NULL, PRIMARY KEY (f4), UNIQUE KEY uk1 (f2) ); INSERT INTO t2 VALUES(1,1,null), (2,2,null); CREATE TABLE t1 ( f8 varchar(32) collate utf8_bin NOT NULL default '', f1 varchar(10) collate utf8_bin default NULL, f9 varchar(32) collate utf8_bin default NULL, PRIMARY KEY (f8) ); INSERT INTO t1 VALUES (1,'P',1), (2,'P',1), (3,'R',2); CREATE TABLE t3 ( f6 varchar(32) collate utf8_bin NOT NULL default '', f5 varchar(50) collate utf8_bin default NULL, PRIMARY KEY (f6) ); INSERT INTO t3 VALUES (1,null), (2,null); SELECT IF(t1.f1 = 'R', a1.f2, t2.f2) AS a4, IF(t1.f1 = 'R', a1.f3, t2.f3) AS f3, SUM( IF( (SELECT VPC.f2 FROM t2 VPC, t4 a2, t2 a3 WHERE VPC.f4 = a2.f10 AND a3.f2 = a4 LIMIT 1) IS NULL, 0, t3.f5 ) ) AS a6 FROM t2, t3, t1 JOIN t2 a1 ON t1.f9 = a1.f4 GROUP BY a4; a4 f3 a6 1 NULL NULL 2 NULL NULL DROP TABLE t1, t2, t3, t4; create table t1 (a float(5,4) zerofill); create table t2 (a float(5,4),b float(2,0)); select t1.a from t1 where t1.a= (select b from t2 limit 1) and not t1.a= (select a from t2 limit 1) ; a drop table t1, t2; # # Bug#45061: Incorrectly market field caused wrong result. # CREATE TABLE `C` ( `int_nokey` int(11) NOT NULL, `int_key` int(11) NOT NULL, KEY `int_key` (`int_key`) ); INSERT INTO `C` VALUES (9,9), (0,0), (8,6), (3,6), (7,6), (0,4), (1,7), (9,4), (0,8), (9,4), (0,7), (5,5), (0,0), (8,5), (8,7), (5,2), (1,8), (7,0), (0,9), (9,5); SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`); int_nokey int_key 9 9 0 0 5 5 0 0 EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE C ALL NULL NULL NULL NULL 20 100.00 Using where DROP TABLE C; # End of test for bug#45061. # # Bug #46749: Segfault in add_key_fields() with outer subquery level # field references # CREATE TABLE t1 ( a int, b int, UNIQUE (a), KEY (b) ); INSERT INTO t1 VALUES (1,1), (2,1); CREATE TABLE st1 like t1; INSERT INTO st1 VALUES (1,1), (2,1); CREATE TABLE st2 like t1; INSERT INTO st2 VALUES (1,1), (2,1); EXPLAIN SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b) FROM t1 WHERE a = 230; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b) FROM t1 WHERE a = 230; MAX(b) (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b) NULL NULL DROP TABLE t1, st1, st2; # # Bug #48709: Assertion failed in sql_select.cc:11782: # int join_read_key(JOIN_TAB*) # CREATE TABLE t1 (pk int PRIMARY KEY, int_key int); INSERT INTO t1 VALUES (10,1), (14,1); CREATE TABLE t2 (pk int PRIMARY KEY, int_key int); INSERT INTO t2 VALUES (3,3), (5,NULL), (7,3); # should have eq_ref for t1, unless subquery materialization is used EXPLAIN SELECT * FROM t2 outr WHERE outr.int_key NOT IN (SELECT t1.pk FROM t1, t2) ORDER BY outr.pk; id select_type table type possible_keys key key_len ref rows Extra x x outr ALL x x x x x x x x t1 index x x x x x x x x t2 index x x x x x x # should not crash on debug binaries SELECT * FROM t2 outr WHERE outr.int_key NOT IN (SELECT t1.pk FROM t1, t2) ORDER BY outr.pk; pk int_key 3 3 7 3 DROP TABLE t1,t2; create table t1 (oref int, grp int, ie int) ; insert into t1 (oref, grp, ie) values (1, 1, 1), (1, 1, 1), (1, 2, NULL), (2, 1, 3), (3, 1, 4), (3, 2, NULL); create table t2 (oref int, a int); insert into t2 values (1, 1), (2, 2), (3, 3), (4, NULL), (2, NULL); select a, oref, a in (select max(ie) from t1 where oref=t2.oref group by grp) Z from t2; a oref Z 1 1 1 2 2 0 3 3 NULL NULL 4 0 NULL 2 NULL explain extended select a, oref, a in (select max(ie) from t1 where oref=t2.oref group by grp) Z from t2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 NULL 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort Warnings: Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>(`test`.`t2`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t1` where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) group by `test`.`t1`.`grp` having <if>(outer_field_is_not_null, (<cache>(`test`.`t2`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`))), true))) AS `Z` from `test`.`t2` explain extended select a, oref from t2 where a in (select max(ie) from t1 where oref=t2.oref group by grp); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort Warnings: Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t1` where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) group by `test`.`t1`.`grp` having (<cache>(`test`.`t2`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`))))) select a, oref, a in ( select max(ie) from t1 where oref=t2.oref group by grp union select max(ie) from t1 where oref=t2.oref group by grp ) Z from t2; a oref Z 1 1 1 2 2 0 3 3 NULL NULL 4 0 NULL 2 NULL create table t3 (a int); insert into t3 values (NULL), (NULL); flush status; select a in (select max(ie) from t1 where oref=4 group by grp) from t3; a in (select max(ie) from t1 where oref=4 group by grp) 0 0 show status like 'Handler_read_rnd_next'; Variable_name Value Handler_read_rnd_next 11 select ' ^ This must show 11' Z; Z ^ This must show 11 explain extended select a in (select max(ie) from t1 where oref=4 group by grp) from t3; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 2 100.00 NULL 2 SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select <in_optimizer>(`test`.`t3`.`a`,`test`.`t3`.`a` in ( <materialize> (/* select#2 */ select max(`test`.`t1`.`ie`) from `test`.`t1` where (`test`.`t1`.`oref` = 4) group by `test`.`t1`.`grp` having 1 ), <primary_index_lookup>(`test`.`t3`.`a` in <temporary table> on <auto_key> where ((`test`.`t3`.`a` = `materialized-subquery`.`max(ie)`))))) AS `a in (select max(ie) from t1 where oref=4 group by grp)` from `test`.`t3` drop table t1, t2, t3; create table t1 (a int, oref int, key(a)); insert into t1 values (1, 1), (1, NULL), (2, 3), (2, NULL), (3, NULL); create table t2 (a int, oref int); insert into t2 values (1, 1), (2,2), (NULL, 3), (NULL, 4); select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2; oref a Z 1 1 1 2 2 0 3 NULL NULL 4 NULL 0 explain extended select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 4 100.00 NULL 2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 100.00 Using where; Full scan on NULL key Warnings: Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,<in_optimizer>(`test`.`t2`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on a checking NULL where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`a`), true)))) AS `Z` from `test`.`t2` flush status; select oref, a from t2 where a in (select a from t1 where oref=t2.oref); oref a 1 1 show status like '%Handler_read_rnd_next'; Variable_name Value Handler_read_rnd_next 11 delete from t2; insert into t2 values (NULL, 0),(NULL, 0), (NULL, 0), (NULL, 0); flush status; select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2; oref a Z 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 show status like '%Handler_read%'; Variable_name Value Handler_read_first 0 Handler_read_key 0 Handler_read_last 0 Handler_read_next 0 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 29 select 'No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1.' Z; Z No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1. drop table t1, t2; create table t1 (a int, b int, primary key (a)); insert into t1 values (1,1), (3,1),(100,1); create table t2 (a int, b int); insert into t2 values (1,1),(2,1),(NULL,1),(NULL,0); select a,b, a in (select a from t1 where t1.b = t2.b) Z from t2 ; a b Z 1 1 1 2 1 0 NULL 1 NULL NULL 0 0 drop table t1, t2; create table t1 (a int, b int, key(a)); insert into t1 values (0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9); create table t2 like t1; insert into t2 select * from t1; update t2 set b=1; create table t3 (a int, oref int); insert into t3 values (1, 1), (NULL,1), (NULL,0); select a, oref, t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z from t3; a oref Z 1 1 1 NULL 1 NULL NULL 0 0 explain extended select a, oref, t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z from t3; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 NULL 2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 4 100.00 Using where; Full scan on NULL key 2 DEPENDENT SUBQUERY t2 ref a a 5 test.t1.b 1 100.00 Using where Warnings: Note 1276 Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<in_optimizer>(`test`.`t3`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`)), true)) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`a`), true))) AS `Z` from `test`.`t3` drop table t1, t2, t3; create table t1 (a int NOT NULL, b int NOT NULL, key(a)); insert into t1 values (0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9); create table t2 like t1; insert into t2 select * from t1; update t2 set b=1; create table t3 (a int, oref int); insert into t3 values (1, 1), (NULL,1), (NULL,0); select a, oref, t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z from t3; a oref Z 1 1 1 NULL 1 NULL NULL 0 0 This must show a trig_cond: explain extended select a, oref, t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z from t3; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 NULL 2 DEPENDENT SUBQUERY t1 ref a a 4 func 2 100.00 Using where; Full scan on NULL key 2 DEPENDENT SUBQUERY t2 ref a a 4 test.t1.b 1 100.00 Using where Warnings: Note 1276 Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<in_optimizer>(`test`.`t3`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and <if>(outer_field_is_not_null, (<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`), true)))) AS `Z` from `test`.`t3` drop table t1,t2,t3; create table t1 (oref int, grp int); insert into t1 (oref, grp) values (1, 1), (1, 1); create table t2 (oref int, a int); insert into t2 values (1, NULL), (2, NULL); select a, oref, a in (select count(*) from t1 group by grp having grp=t2.oref) Z from t2; a oref Z NULL 1 NULL NULL 2 0 This must show a trig_cond: explain extended select a, oref, a in (select count(*) from t1 group by grp having grp=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 NULL 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort Warnings: Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>(`test`.`t2`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t1` group by `test`.`t1`.`grp` having ((`test`.`t1`.`grp` = `test`.`t2`.`oref`) and <if>(outer_field_is_not_null, (<cache>(`test`.`t2`.`a`) = <ref_null_helper>(count(0))), true)))) AS `Z` from `test`.`t2` drop table t1, t2; create table t1 (a int, b int, primary key (a)); insert into t1 values (1,1), (3,1),(100,1); create table t2 (a int, b int); insert into t2 values (1,1),(2,1),(NULL,1),(NULL,0); select a,b, a in (select a from t1 where t1.b = t2.b union select a from t1 where t1.b = t2.b) Z from t2 ; a b Z 1 1 1 2 1 0 NULL 1 NULL NULL 0 0 select a,b, a in (select a from t1 where t1.b = t2.b) Z from t2 ; a b Z 1 1 1 2 1 0 NULL 1 NULL NULL 0 0 drop table t1, t2; create table t3 (a int); insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t2 (a int, b int, oref int); insert into t2 values (NULL,1, 100), (NULL,2, 100); create table t1 (a int, b int, c int, key(a,b)); insert into t1 select 2*A, 2*A, 100 from t3; explain extended select a,b, oref, (a,b) in (select a,b from t1 where c=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 NULL 2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 100.00 Using where; Full scan on NULL key Warnings: Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on a checking NULL where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`)), true) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`a`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`b`), true))))) AS `Z` from `test`.`t2` select a,b, oref, (a,b) in (select a,b from t1 where c=t2.oref) Z from t2; a b oref Z NULL 1 100 0 NULL 2 100 NULL create table t4 (x int); insert into t4 select A.a + 10*B.a from t1 A, t1 B; explain extended select a,b, oref, (a,b) in (select a,b from t1,t4 where c=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 NULL 2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 2 100.00 Using where; Full scan on NULL key 2 DEPENDENT SUBQUERY t4 ALL NULL NULL NULL NULL 100 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(/* select#2 */ select 1,1 from `test`.`t1` join `test`.`t4` where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`)), true) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`a`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`b`), true)))) AS `Z` from `test`.`t2` select a,b, oref, (a,b) in (select a,b from t1,t4 where c=t2.oref) Z from t2; a b oref Z NULL 1 100 0 NULL 2 100 NULL drop table t1,t2,t3,t4; create table t1 (oref char(4), grp int, ie1 int, ie2 int); insert into t1 (oref, grp, ie1, ie2) values ('aa', 10, 2, 1), ('aa', 10, 1, 1), ('aa', 20, 2, 1), ('bb', 10, 3, 1), ('cc', 10, 4, 2), ('cc', 20, 3, 2), ('ee', 10, 2, 1), ('ee', 10, 1, 2), ('ff', 20, 2, 2), ('ff', 20, 1, 2); create table t2 (oref char(4), a int, b int); insert into t2 values ('ee', NULL, 1), ('bb', 2, 1), ('ff', 2, 2), ('cc', 3, NULL), ('bb', NULL, NULL), ('aa', 1, 1), ('dd', 1, NULL); alter table t1 add index idx(ie1,ie2); select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2 where a=3 and b is null ; oref a b Z cc 3 NULL NULL insert into t2 values ('new1', 10,10); insert into t1 values ('new1', 1234, 10, NULL); select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2 where a=10 and b=10; oref a b Z new1 10 10 NULL explain extended select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2 where a=10 and b=10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 8 100.00 Using where 2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 100.00 Using where; Full scan on NULL key Warnings: Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on idx checking NULL where ((`test`.`t1`.`oref` = `test`.`t2`.`oref`) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`ie1`) or isnull(`test`.`t1`.`ie1`)), true) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`ie2`) or isnull(`test`.`t1`.`ie2`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`ie1`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`ie2`), true))))) AS `Z` from `test`.`t2` where ((`test`.`t2`.`b` = 10) and (`test`.`t2`.`a` = 10)) drop table t1, t2; create table t1 (oref char(4), grp int, ie int); insert into t1 (oref, grp, ie) values ('aa', 10, 2), ('aa', 10, 1), ('aa', 20, NULL), ('bb', 10, 3), ('cc', 10, 4), ('cc', 20, NULL), ('ee', 10, NULL), ('ee', 10, NULL), ('ff', 20, 2), ('ff', 20, 1); create table t2 (oref char(4), a int); insert into t2 values ('ee', NULL), ('bb', 2), ('ff', 2), ('cc', 3), ('aa', 1), ('dd', NULL), ('bb', NULL); select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2; oref a Z ee NULL NULL bb 2 0 ff 2 1 cc 3 NULL aa 1 1 dd NULL 0 bb NULL NULL select oref, a from t2 where a in (select ie from t1 where oref=t2.oref); oref a aa 1 ff 2 select oref, a from t2 where a not in (select ie from t1 where oref=t2.oref); oref a bb 2 dd NULL select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp) Z from t2; oref a Z ee NULL NULL bb 2 0 ff 2 0 cc 3 NULL aa 1 1 dd NULL 0 bb NULL NULL select oref, a from t2 where a in (select min(ie) from t1 where oref=t2.oref group by grp); oref a aa 1 select oref, a from t2 where a not in (select min(ie) from t1 where oref=t2.oref group by grp); oref a bb 2 ff 2 dd NULL update t1 set ie=3 where oref='ff' and ie=1; select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp) Z from t2; oref a Z ee NULL NULL bb 2 0 ff 2 1 cc 3 NULL aa 1 1 dd NULL 0 bb NULL NULL select oref, a from t2 where a in (select min(ie) from t1 where oref=t2.oref group by grp); oref a ff 2 aa 1 select oref, a from t2 where a not in (select min(ie) from t1 where oref=t2.oref group by grp); oref a bb 2 dd NULL select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp having min(ie) > 1) Z from t2; oref a Z ee NULL 0 bb 2 0 ff 2 1 cc 3 0 aa 1 0 dd NULL 0 bb NULL NULL select oref, a from t2 where a in (select min(ie) from t1 where oref=t2.oref group by grp having min(ie) > 1); oref a ff 2 select oref, a from t2 where a not in (select min(ie) from t1 where oref=t2.oref group by grp having min(ie) > 1); oref a ee NULL bb 2 cc 3 aa 1 dd NULL alter table t1 add index idx(ie); explain select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 NULL 2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 Using where; Full scan on NULL key select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2; oref a Z ee NULL NULL bb 2 0 ff 2 1 cc 3 NULL aa 1 1 dd NULL 0 bb NULL NULL select oref, a from t2 where a in (select ie from t1 where oref=t2.oref); oref a aa 1 ff 2 select oref, a from t2 where a not in (select ie from t1 where oref=t2.oref); oref a bb 2 dd NULL alter table t1 drop index idx; alter table t1 add index idx(oref,ie); explain select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 NULL 2 DEPENDENT SUBQUERY t1 ref_or_null idx idx 10 test.t2.oref,func 4 Using where; Using index; Full scan on NULL key select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2; oref a Z ee NULL NULL bb 2 0 ff 2 1 cc 3 NULL aa 1 1 dd NULL 0 bb NULL NULL select oref, a from t2 where a in (select ie from t1 where oref=t2.oref); oref a ff 2 aa 1 select oref, a from t2 where a not in (select ie from t1 where oref=t2.oref); oref a bb 2 dd NULL explain select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp having min(ie) > 1) Z from t2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 NULL 2 DEPENDENT SUBQUERY t1 ref idx idx 5 test.t2.oref 2 Using where; Using temporary; Using filesort select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp having min(ie) > 1) Z from t2; oref a Z ee NULL 0 bb 2 0 ff 2 1 cc 3 0 aa 1 0 dd NULL 0 bb NULL NULL select oref, a from t2 where a in (select min(ie) from t1 where oref=t2.oref group by grp having min(ie) > 1); oref a ff 2 select oref, a from t2 where a not in (select min(ie) from t1 where oref=t2.oref group by grp having min(ie) > 1); oref a ee NULL bb 2 cc 3 aa 1 dd NULL drop table t1,t2; create table t1 (oref char(4), grp int, ie1 int, ie2 int); insert into t1 (oref, grp, ie1, ie2) values ('aa', 10, 2, 1), ('aa', 10, 1, 1), ('aa', 20, 2, 1), ('bb', 10, 3, 1), ('cc', 10, 4, 2), ('cc', 20, 3, 2), ('ee', 10, 2, 1), ('ee', 10, 1, 2), ('ff', 20, 2, 2), ('ff', 20, 1, 2); create table t2 (oref char(4), a int, b int); insert into t2 values ('ee', NULL, 1), ('bb', 2, 1), ('ff', 2, 2), ('cc', 3, NULL), ('bb', NULL, NULL), ('aa', 1, 1), ('dd', 1, NULL); select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2; oref a b Z ee NULL 1 NULL bb 2 1 0 ff 2 2 1 cc 3 NULL NULL bb NULL NULL NULL aa 1 1 1 dd 1 NULL 0 select oref, a, b from t2 where (a,b) in (select ie1,ie2 from t1 where oref=t2.oref); oref a b aa 1 1 ff 2 2 select oref, a, b from t2 where (a,b) not in (select ie1,ie2 from t1 where oref=t2.oref); oref a b bb 2 1 dd 1 NULL select oref, a, b, (a,b) in (select min(ie1),max(ie2) from t1 where oref=t2.oref group by grp) Z from t2; oref a b Z ee NULL 1 0 bb 2 1 0 ff 2 2 0 cc 3 NULL NULL bb NULL NULL NULL aa 1 1 1 dd 1 NULL 0 select oref, a, b from t2 where (a,b) in (select min(ie1), max(ie2) from t1 where oref=t2.oref group by grp); oref a b aa 1 1 select oref, a, b from t2 where (a,b) not in (select min(ie1), max(ie2) from t1 where oref=t2.oref group by grp); oref a b ee NULL 1 bb 2 1 ff 2 2 dd 1 NULL alter table t1 add index idx(ie1,ie2); explain select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 NULL 2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 Using where; Full scan on NULL key select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2; oref a b Z ee NULL 1 NULL bb 2 1 0 ff 2 2 1 cc 3 NULL NULL bb NULL NULL NULL aa 1 1 1 dd 1 NULL 0 select oref, a, b from t2 where (a,b) in (select ie1,ie2 from t1 where oref=t2.oref); oref a b aa 1 1 ff 2 2 select oref, a, b from t2 where (a,b) not in (select ie1,ie2 from t1 where oref=t2.oref); oref a b bb 2 1 dd 1 NULL explain extended select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 100.00 NULL 2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 100.00 Using where; Full scan on NULL key Warnings: Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on idx checking NULL where ((`test`.`t1`.`oref` = `test`.`t2`.`oref`) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`ie1`) or isnull(`test`.`t1`.`ie1`)), true) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`ie2`) or isnull(`test`.`t1`.`ie2`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`ie1`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t1`.`ie2`), true))))) AS `Z` from `test`.`t2` drop table t1,t2; create table t1 (oref char(4), grp int, ie int primary key); insert into t1 (oref, grp, ie) values ('aa', 10, 2), ('aa', 10, 1), ('bb', 10, 3), ('cc', 10, 4), ('cc', 20, 5), ('cc', 10, 6); create table t2 (oref char(4), a int); insert into t2 values ('ee', NULL), ('bb', 2), ('cc', 5), ('cc', 2), ('cc', NULL), ('aa', 1), ('bb', NULL); explain select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 NULL 2 DEPENDENT SUBQUERY t1 unique_subquery PRIMARY PRIMARY 4 func 1 Using where; Full scan on NULL key select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2; oref a Z ee NULL 0 bb 2 0 cc 5 1 cc 2 0 cc NULL NULL aa 1 1 bb NULL NULL select oref, a from t2 where a in (select ie from t1 where oref=t2.oref); oref a aa 1 cc 5 select oref, a from t2 where a not in (select ie from t1 where oref=t2.oref); oref a ee NULL bb 2 cc 2 explain select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp) Z from t2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 NULL 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 Using where; Using temporary; Using filesort select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp) Z from t2; oref a Z ee NULL 0 bb 2 0 cc 5 1 cc 2 0 cc NULL NULL aa 1 1 bb NULL NULL drop table t1,t2; create table t1 (a int, b int); insert into t1 values (0,0), (2,2), (3,3); create table t2 (a int, b int); insert into t2 values (1,1), (3,3); select a, b, (a,b) in (select a, min(b) from t2 group by a) Z from t1; a b Z 0 0 0 2 2 0 3 3 1 insert into t2 values (NULL,4); select a, b, (a,b) in (select a, min(b) from t2 group by a) Z from t1; a b Z 0 0 0 2 2 0 3 3 1 drop table t1,t2; CREATE TABLE t1 (a int, b INT, c CHAR(10) NOT NULL, PRIMARY KEY (a, b)); INSERT INTO t1 VALUES (1,1,'a'), (1,2,'b'), (1,3,'c'), (1,4,'d'), (1,5,'e'), (2,1,'f'), (2,2,'g'), (2,3,'h'), (3,4,'i'),(3,3,'j'), (3,2,'k'), (3,1,'l'), (1,9,'m'); CREATE TABLE t2 (a int, b INT, c CHAR(10) NOT NULL, PRIMARY KEY (a, b)); INSERT INTO t2 SELECT * FROM t1; SELECT a, MAX(b), (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b)) as test FROM t1 GROUP BY a; a MAX(b) test 1 9 m 2 3 h 3 4 i SELECT * FROM t1 GROUP by t1.a HAVING (MAX(t1.b) > (SELECT MAX(t2.b) FROM t2 WHERE t2.c < t1.c HAVING MAX(t2.b+t1.a) < 10)); a b c SELECT a,b,c FROM t1 WHERE b in (9,3,4) ORDER BY b,c; a b c 1 3 c 2 3 h 3 3 j 1 4 d 3 4 i 1 9 m SELECT a, MAX(b), (SELECT COUNT(DISTINCT t.c) FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) LIMIT 1) as cnt, (SELECT t.b FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) LIMIT 1) as t_b, (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) LIMIT 1) as t_b, (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) ORDER BY t.c LIMIT 1) as t_b FROM t1 GROUP BY a; a MAX(b) cnt t_b t_b t_b 1 9 1 9 m m 2 3 1 3 h h 3 4 1 4 i i SELECT a, MAX(b), (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) LIMIT 1) as test FROM t1 GROUP BY a; a MAX(b) test 1 9 m 2 3 h 3 4 i DROP TABLE t1, t2; CREATE TABLE t1 (a int); CREATE TABLE t2 (b int, PRIMARY KEY(b)); INSERT INTO t1 VALUES (1), (NULL), (4); INSERT INTO t2 VALUES (3), (1),(2), (5), (4), (7), (6); EXPLAIN EXTENDED SELECT a FROM t1, t2 WHERE a=b AND (b NOT IN (SELECT a FROM t1)); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 100.00 Using index 2 SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`b` = `test`.`t1`.`a`) and (not(<in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (/* select#2 */ select `test`.`t1`.`a` from `test`.`t1` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`a`)))))))) SELECT a FROM t1, t2 WHERE a=b AND (b NOT IN (SELECT a FROM t1)); a SELECT a FROM t1, t2 WHERE a=b AND (b NOT IN (SELECT a FROM t1 WHERE a > 4)); a 1 4 DROP TABLE t1,t2; CREATE TABLE t1 (id int); CREATE TABLE t2 (id int PRIMARY KEY); CREATE TABLE t3 (id int PRIMARY KEY, name varchar(10)); INSERT INTO t1 VALUES (2), (NULL), (3), (1); INSERT INTO t2 VALUES (234), (345), (457); INSERT INTO t3 VALUES (222,'bbb'), (333,'ccc'), (111,'aaa'); EXPLAIN SELECT * FROM t1 WHERE t1.id NOT IN (SELECT t2.id FROM t2,t3 WHERE t3.name='xxx' AND t2.id=t3.id); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where 2 SUBQUERY t2 index PRIMARY PRIMARY 4 NULL 3 Using index 2 SUBQUERY t3 eq_ref PRIMARY PRIMARY 4 test.t2.id 1 Using where SELECT * FROM t1 WHERE t1.id NOT IN (SELECT t2.id FROM t2,t3 WHERE t3.name='xxx' AND t2.id=t3.id); id 2 NULL 3 1 SELECT (t1.id IN (SELECT t2.id FROM t2,t3 WHERE t3.name='xxx' AND t2.id=t3.id)) AS x FROM t1; x 0 0 0 0 DROP TABLE t1,t2,t3; CREATE TABLE t1 (a INT NOT NULL); INSERT INTO t1 VALUES (1),(-1), (65),(66); CREATE TABLE t2 (a INT UNSIGNED NOT NULL PRIMARY KEY); INSERT INTO t2 VALUES (65),(66); SELECT a FROM t1 WHERE a NOT IN (65,66); a 1 -1 SELECT a FROM t1 WHERE a NOT IN (SELECT a FROM t2); a 1 -1 EXPLAIN SELECT a FROM t1 WHERE a NOT IN (SELECT a FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where 2 SUBQUERY t2 index PRIMARY PRIMARY 4 NULL 2 Using index DROP TABLE t1, t2; CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES(1); CREATE TABLE t2 (placeholder CHAR(11)); INSERT INTO t2 VALUES("placeholder"); SELECT ROW(1, 2) IN (SELECT t1.a, 2) FROM t1 GROUP BY t1.a; ROW(1, 2) IN (SELECT t1.a, 2) 1 SELECT ROW(1, 2) IN (SELECT t1.a, 2 FROM t2) FROM t1 GROUP BY t1.a; ROW(1, 2) IN (SELECT t1.a, 2 FROM t2) 1 DROP TABLE t1, t2; CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1),(2),(3); CREATE TABLE t2 SELECT * FROM t1; SELECT 1 FROM t1 WHERE t1.a NOT IN (SELECT 1 FROM t1, t2 WHERE 0); 1 1 1 1 DROP TABLE t1, t2; create table t1 (a int, b decimal(13, 3)); insert into t1 values (1, 0.123); select a, (select max(b) from t1) into outfile "subselect.out.file.1" from t1; delete from t1; load data infile "subselect.out.file.1" into table t1; select * from t1; a b 1 0.123 drop table t1; CREATE TABLE t1 ( pk INT PRIMARY KEY, int_key INT, varchar_key VARCHAR(5) UNIQUE, varchar_nokey VARCHAR(5) ); INSERT INTO t1 VALUES (9, 7,NULL,NULL), (10,8,'p' ,'p'); SELECT varchar_nokey FROM t1 WHERE NULL NOT IN ( SELECT INNR.pk FROM t1 AS INNR2 LEFT JOIN t1 AS INNR ON ( INNR2.int_key = INNR.int_key ) WHERE INNR.varchar_key > 'n{' ); varchar_nokey DROP TABLE t1; CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (11); # 2nd and 3rd columns should be same SELECT a, ROW(11, 12) = (SELECT a, 22), ROW(11, 12) IN (SELECT a, 22) FROM t1 GROUP BY t1.a; a ROW(11, 12) = (SELECT a, 22) ROW(11, 12) IN (SELECT a, 22) 1 0 0 2 0 0 11 0 0 SELECT a, ROW(11, 12) = (SELECT a, 12), ROW(11, 12) IN (SELECT a, 12) FROM t1 GROUP BY t1.a; a ROW(11, 12) = (SELECT a, 12) ROW(11, 12) IN (SELECT a, 12) 1 0 0 2 0 0 11 1 1 SELECT a, ROW(11, 12) = (SELECT a, 22), ROW(11, 12) IN (SELECT a, 22) FROM t1; a ROW(11, 12) = (SELECT a, 22) ROW(11, 12) IN (SELECT a, 22) 1 0 0 2 0 0 11 0 0 SELECT a, ROW(11, 12) = (SELECT a, 12), ROW(11, 12) IN (SELECT a, 12) FROM t1; a ROW(11, 12) = (SELECT a, 12) ROW(11, 12) IN (SELECT a, 12) 1 0 0 2 0 0 11 1 1 SELECT a AS x, ROW(11, 12) = (SELECT MAX(x), 22), ROW(11, 12) IN (SELECT MAX(x), 22) FROM t1; x ROW(11, 12) = (SELECT MAX(x), 22) ROW(11, 12) IN (SELECT MAX(x), 22) 1 0 0 2 0 0 11 0 0 SELECT a AS x, ROW(11, 12) = (SELECT MAX(x), 12), ROW(11, 12) IN (SELECT MAX(x), 12) FROM t1; x ROW(11, 12) = (SELECT MAX(x), 12) ROW(11, 12) IN (SELECT MAX(x), 12) 1 0 0 2 0 0 11 1 1 DROP TABLE t1; # both columns should be same SELECT ROW(1,2) = (SELECT NULL, NULL), ROW(1,2) IN (SELECT NULL, NULL); ROW(1,2) = (SELECT NULL, NULL) ROW(1,2) IN (SELECT NULL, NULL) NULL NULL SELECT ROW(1,2) = (SELECT 1, NULL), ROW(1,2) IN (SELECT 1, NULL); ROW(1,2) = (SELECT 1, NULL) ROW(1,2) IN (SELECT 1, NULL) NULL NULL SELECT ROW(1,2) = (SELECT NULL, 2), ROW(1,2) IN (SELECT NULL, 2); ROW(1,2) = (SELECT NULL, 2) ROW(1,2) IN (SELECT NULL, 2) NULL NULL SELECT ROW(1,2) = (SELECT NULL, 1), ROW(1,2) IN (SELECT NULL, 1); ROW(1,2) = (SELECT NULL, 1) ROW(1,2) IN (SELECT NULL, 1) 0 0 SELECT ROW(1,2) = (SELECT 1, 1), ROW(1,2) IN (SELECT 1, 1); ROW(1,2) = (SELECT 1, 1) ROW(1,2) IN (SELECT 1, 1) 0 0 SELECT ROW(1,2) = (SELECT 1, 2), ROW(1,2) IN (SELECT 1, 2); ROW(1,2) = (SELECT 1, 2) ROW(1,2) IN (SELECT 1, 2) 1 1 CREATE TABLE t1 (a INT, b INT, c INT); INSERT INTO t1 VALUES (1,1,1), (1,1,1); EXPLAIN EXTENDED SELECT c FROM ( SELECT (SELECT COUNT(a) FROM (SELECT COUNT(b) FROM t1) AS x GROUP BY c ) FROM t1 GROUP BY b ) AS y; ERROR 42S22: Unknown column 'c' in 'field list' SHOW WARNINGS; Level Code Message Note 1276 Field or reference 'test.t1.a' of SELECT #3 was resolved in SELECT #2 Note 1276 Field or reference 'test.t1.c' of SELECT #3 was resolved in SELECT #2 Error 1054 Unknown column 'c' in 'field list' DROP TABLE t1; # # Bug #46791: Assertion failed:(table->key_read==0),function unknown # function,file sql_base.cc # CREATE TABLE t1 (a INT, b INT, KEY(a)); INSERT INTO t1 VALUES (1,1),(2,2); CREATE TABLE t2 LIKE t1; INSERT INTO t2 VALUES (1,1),(2,2); CREATE TABLE t3 LIKE t1; # should have 1 impossible where and 2 dependent subqueries EXPLAIN SELECT 1 FROM t1 WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3)) ORDER BY count(*); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 index NULL a 5 NULL 2 Using index 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table # should not crash the next statement SELECT 1 FROM t1 WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3)) ORDER BY count(*); 1 1 # should not crash: the crash is caused by the previous statement SELECT 1; 1 1 DROP TABLE t1,t2,t3; # # Bug #47106: Crash / segfault on adding EXPLAIN to a non-crashing # query # CREATE TABLE t1 ( a INT, b INT, PRIMARY KEY (a), KEY b (b) ); INSERT INTO t1 VALUES (1, 1), (2, 1); CREATE TABLE t2 LIKE t1; INSERT INTO t2 SELECT * FROM t1; CREATE TABLE t3 LIKE t1; INSERT INTO t3 SELECT * FROM t1; # Should not crash. # Should have 1 impossible where and 2 dependent subqs. EXPLAIN SELECT (SELECT 1 FROM t1,t2 WHERE t2.b > t3.b) FROM t3 WHERE 1 = 0 GROUP BY 1; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 DEPENDENT SUBQUERY t1 index NULL PRIMARY 4 NULL 2 Using index 2 DEPENDENT SUBQUERY t2 ALL b NULL NULL NULL 2 Range checked for each record (index map: 0x2) # should return 0 rows SELECT (SELECT 1 FROM t1,t2 WHERE t2.b > t3.b) FROM t3 WHERE 1 = 0 GROUP BY 1; (SELECT 1 FROM t1,t2 WHERE t2.b > t3.b) DROP TABLE t1,t2,t3; # # Bug#12329653 # EXPLAIN, UNION, PREPARED STATEMENT, CRASH, SQL_FULL_GROUP_BY # CREATE TABLE t1(a1 int); INSERT INTO t1 VALUES (1),(2); SELECT @@session.sql_mode INTO @old_sql_mode; SET SESSION sql_mode='ONLY_FULL_GROUP_BY'; SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1); 1 1 1 PREPARE stmt FROM 'SELECT 1 UNION ALL SELECT 1 FROM t1 ORDER BY (SELECT 1 FROM t1 AS t1_0 WHERE 1 < SOME (SELECT a1 FROM t1) )' ; EXECUTE stmt ; ERROR 21000: Subquery returns more than 1 row EXECUTE stmt ; ERROR 21000: Subquery returns more than 1 row SET SESSION sql_mode=@old_sql_mode; DEALLOCATE PREPARE stmt; DROP TABLE t1; # # Bug#12763207 - ASSERT IN SUBSELECT::SINGLE_VALUE_TRANSFORMER # CREATE TABLE t1(a1 int); INSERT INTO t1 VALUES (1),(2); CREATE TABLE t2(a1 int); INSERT INTO t2 VALUES (3); SELECT @@session.sql_mode INTO @old_sql_mode; SET SESSION sql_mode='ONLY_FULL_GROUP_BY'; SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 2 FROM t2); 1 1 1 SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 2.0 FROM t2); 1 1 1 SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 'a' FROM t2); 1 SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t2); 1 1 1 SET SESSION sql_mode=@old_sql_mode; DROP TABLE t1, t2; # # Bug#12763207 - ASSERT IN SUBSELECT::SINGLE_VALUE_TRANSFORMER # create table t2(i int); insert into t2 values(0); SELECT @@session.sql_mode INTO @old_sql_mode; SET SESSION sql_mode='ONLY_FULL_GROUP_BY'; CREATE VIEW v1 AS SELECT 'f' FROM t2 UNION SELECT 'x' FROM t2 ; CREATE TABLE t1 ( pk int NOT NULL, col_varchar_key varchar(1) DEFAULT NULL, PRIMARY KEY (pk), KEY col_varchar_key (col_varchar_key) ); SELECT t1.pk FROM t1 WHERE t1.col_varchar_key < ALL ( SELECT * FROM v1 ) ; pk SET SESSION sql_mode=@old_sql_mode; drop table t2, t1; drop view v1; End of 5.0 tests. create table t_out (subcase char(3), a1 char(2), b1 char(2), c1 char(2)); create table t_in (a2 char(2), b2 char(2), c2 char(2)); insert into t_out values ('A.1','2a', NULL, '2a'); insert into t_out values ('A.3', '2a', NULL, '2a'); insert into t_out values ('A.4', '2a', NULL, 'xx'); insert into t_out values ('B.1', '2a', '2a', '2a'); insert into t_out values ('B.2', '2a', '2a', '2a'); insert into t_out values ('B.3', '3a', 'xx', '3a'); insert into t_out values ('B.4', 'xx', '3a', '3a'); insert into t_in values ('1a', '1a', '1a'); insert into t_in values ('2a', '2a', '2a'); insert into t_in values (NULL, '2a', '2a'); insert into t_in values ('3a', NULL, '3a'); Test general IN semantics (not top-level) case A.1 select subcase, (a1, b1, c1) IN (select * from t_in where a2 = 'no_match') pred_in, (a1, b1, c1) NOT IN (select * from t_in where a2 = 'no_match') pred_not_in from t_out where subcase = 'A.1'; subcase pred_in pred_not_in A.1 0 1 case A.2 - impossible case A.3 select subcase, (a1, b1, c1) IN (select * from t_in) pred_in, (a1, b1, c1) NOT IN (select * from t_in) pred_not_in from t_out where subcase = 'A.3'; subcase pred_in pred_not_in A.3 NULL NULL case A.4 select subcase, (a1, b1, c1) IN (select * from t_in) pred_in, (a1, b1, c1) NOT IN (select * from t_in) pred_not_in from t_out where subcase = 'A.4'; subcase pred_in pred_not_in A.4 0 1 case B.1 select subcase, (a1, b1, c1) IN (select * from t_in where a2 = 'no_match') pred_in, (a1, b1, c1) NOT IN (select * from t_in where a2 = 'no_match') pred_not_in from t_out where subcase = 'B.1'; subcase pred_in pred_not_in B.1 0 1 case B.2 select subcase, (a1, b1, c1) IN (select * from t_in) pred_in, (a1, b1, c1) NOT IN (select * from t_in) pred_not_in from t_out where subcase = 'B.2'; subcase pred_in pred_not_in B.2 1 0 case B.3 select subcase, (a1, b1, c1) IN (select * from t_in) pred_in, (a1, b1, c1) NOT IN (select * from t_in) pred_not_in from t_out where subcase = 'B.3'; subcase pred_in pred_not_in B.3 NULL NULL case B.4 select subcase, (a1, b1, c1) IN (select * from t_in) pred_in, (a1, b1, c1) NOT IN (select * from t_in) pred_not_in from t_out where subcase = 'B.4'; subcase pred_in pred_not_in B.4 0 1 Test IN as top-level predicate, and as non-top level for cases A.3, B.3 (the only cases with NULL result). case A.1 select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out where subcase = 'A.1' and (a1, b1, c1) IN (select * from t_in where a1 = 'no_match'); pred_in F select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out where subcase = 'A.1' and (a1, b1, c1) NOT IN (select * from t_in where a1 = 'no_match'); pred_not_in T select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out where subcase = 'A.1' and NOT((a1, b1, c1) IN (select * from t_in where a1 = 'no_match')); not_pred_in T case A.3 select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out where subcase = 'A.3' and (a1, b1, c1) IN (select * from t_in); pred_in F select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out where subcase = 'A.3' and (a1, b1, c1) NOT IN (select * from t_in); pred_not_in F select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out where subcase = 'A.3' and NOT((a1, b1, c1) IN (select * from t_in)); not_pred_in F test non-top level result indirectly select case when count(*) > 0 then 'N' else 'wrong result' end as pred_in from t_out where subcase = 'A.3' and ((a1, b1, c1) IN (select * from t_in)) is NULL and ((a1, b1, c1) NOT IN (select * from t_in)) is NULL; pred_in N case A.4 select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out where subcase = 'A.4' and (a1, b1, c1) IN (select * from t_in); pred_in F select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out where subcase = 'A.4' and (a1, b1, c1) NOT IN (select * from t_in); pred_not_in T select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out where subcase = 'A.4' and NOT((a1, b1, c1) IN (select * from t_in)); not_pred_in T case B.1 select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out where subcase = 'B.1' and (a1, b1, c1) IN (select * from t_in where a1 = 'no_match'); pred_in F select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out where subcase = 'B.1' and (a1, b1, c1) NOT IN (select * from t_in where a1 = 'no_match'); pred_not_in T select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out where subcase = 'B.1' and NOT((a1, b1, c1) IN (select * from t_in where a1 = 'no_match')); not_pred_in T case B.2 select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out where subcase = 'B.2' and (a1, b1, c1) IN (select * from t_in); pred_in T select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out where subcase = 'B.2' and (a1, b1, c1) NOT IN (select * from t_in); pred_not_in F select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out where subcase = 'B.2' and NOT((a1, b1, c1) IN (select * from t_in)); not_pred_in F case B.3 select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out where subcase = 'B.3' and (a1, b1, c1) IN (select * from t_in); pred_in F select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out where subcase = 'B.3' and (a1, b1, c1) NOT IN (select * from t_in); pred_not_in F select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out where subcase = 'B.3' and NOT((a1, b1, c1) IN (select * from t_in)); not_pred_in F test non-top level result indirectly select case when count(*) > 0 then 'N' else 'wrong result' end as pred_in from t_out where subcase = 'B.3' and ((a1, b1, c1) IN (select * from t_in)) is NULL and ((a1, b1, c1) NOT IN (select * from t_in)) is NULL; pred_in N case B.4 select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out where subcase = 'B.4' and (a1, b1, c1) IN (select * from t_in); pred_in F select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out where subcase = 'B.4' and (a1, b1, c1) NOT IN (select * from t_in); pred_not_in T select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out where subcase = 'B.4' and NOT((a1, b1, c1) IN (select * from t_in)); not_pred_in T drop table t_out; drop table t_in; CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (2,22),(1,11),(2,22); SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a; a 1 2 SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 1 GROUP BY a; a SELECT a FROM t1 t0 WHERE (SELECT COUNT(t0.b) FROM t1 t WHERE t.b>20) GROUP BY a; a 1 2 SET @@sql_mode='ansi'; SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a; ERROR HY000: Invalid use of group function SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 1 GROUP BY a; ERROR HY000: Invalid use of group function SELECT a FROM t1 t0 WHERE (SELECT COUNT(t0.b) FROM t1 t WHERE t.b>20) GROUP BY a; ERROR HY000: Invalid use of group function SET @@sql_mode=default; DROP TABLE t1; CREATE TABLE t1 (s1 CHAR(1)); INSERT INTO t1 VALUES ('a'); SELECT * FROM t1 WHERE _utf8'a' = ANY (SELECT s1 FROM t1); s1 a DROP TABLE t1; CREATE TABLE t1(c INT, KEY(c)); CREATE TABLE t2(a INT, b INT); INSERT INTO t2 VALUES (1, 10), (2, NULL); INSERT INTO t1 VALUES (1), (3); SELECT * FROM t2 WHERE b NOT IN (SELECT max(t.c) FROM t1, t1 t WHERE t.c>10); a b DROP TABLE t1,t2; CREATE TABLE t1(pk INT PRIMARY KEY, a INT, INDEX idx(a)); INSERT INTO t1 VALUES (1, 10), (3, 30), (2, 20); CREATE TABLE t2(pk INT PRIMARY KEY, a INT, b INT, INDEX idxa(a)); INSERT INTO t2 VALUES (2, 20, 700), (1, 10, 200), (4, 10, 100); SELECT * FROM t1 WHERE EXISTS (SELECT DISTINCT a FROM t2 WHERE t1.a < t2.a ORDER BY b); pk a 1 10 DROP TABLE t1,t2; CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a), KEY b (b)); INSERT INTO t1 VALUES (1,NULL), (9,NULL); CREATE TABLE t2 ( a INT, b INT, c INT, d INT, PRIMARY KEY (a), UNIQUE KEY b (b,c,d), KEY b_2 (b), KEY c (c), KEY d (d) ); INSERT INTO t2 VALUES (43, 2, 11 ,30), (44, 2, 12 ,30), (45, 1, 1 ,10000), (46, 1, 2 ,10000), (556,1, 32 ,10000); CREATE TABLE t3 ( a INT, b INT, c INT, PRIMARY KEY (a), UNIQUE KEY b (b,c), KEY c (c), KEY b_2 (b) ); INSERT INTO t3 VALUES (1,1,1), (2,32,1); explain SELECT t1.a, (SELECT 1 FROM t2 WHERE t2.b=t3.c AND t2.c=t1.a ORDER BY t2.d LIMIT 1) AS incorrect FROM t1, t3 WHERE t3.b=t1.a; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t3 index b,b_2 b 10 NULL 2 Using where; Using index 1 PRIMARY t1 eq_ref PRIMARY PRIMARY 4 test.t3.b 1 Using index 2 DEPENDENT SUBQUERY t2 ref b,b_2,c b 10 test.t3.c,test.t1.a 1 Using where; Using index; Using filesort SELECT t1.a, (SELECT 1 FROM t2 WHERE t2.b=t3.c AND t2.c=t1.a ORDER BY t2.d LIMIT 1) AS incorrect FROM t1, t3 WHERE t3.b=t1.a; a incorrect 1 1 DROP TABLE t1,t2,t3; CREATE TABLE t1 (id int); CREATE TABLE t2 (id int, c int); INSERT INTO t1 (id) VALUES (1); INSERT INTO t2 (id) VALUES (1); INSERT INTO t1 (id) VALUES (1); INSERT INTO t2 (id) VALUES (1); CREATE VIEW v1 AS SELECT t2.c AS c FROM t1, t2 WHERE t1.id=t2.id AND 1 IN (SELECT id FROM t1) WITH CHECK OPTION; UPDATE v1 SET c=1; CREATE VIEW v2 (a,b) AS SELECT t2.id, t2.c AS c FROM t1, t2 WHERE t1.id=t2.id AND 1 IN (SELECT id FROM t1) WITH CHECK OPTION; INSERT INTO v2(a,b) VALUES (2,2); ERROR HY000: CHECK OPTION failed 'test.v2' INSERT INTO v2(a,b) VALUES (1,2); SELECT * FROM v1; c 1 1 1 1 2 2 CREATE VIEW v3 AS SELECT t2.c AS c FROM t2 WHERE 1 IN (SELECT id FROM t1) WITH CHECK OPTION; DELETE FROM v3; DROP VIEW v1,v2,v3; DROP TABLE t1,t2; # # Bug#37822 Correlated subquery with IN and IS UNKNOWN provides wrong result # create table t1(id integer primary key, g integer, v integer, s char(1)); create table t2(id integer primary key, g integer, v integer, s char(1)); insert into t1 values (10, 10, 10, 'l'), (20, 20, 20, 'l'), (40, 40, 40, 'l'), (41, 40, null, 'l'), (50, 50, 50, 'l'), (51, 50, null, 'l'), (60, 60, 60, 'l'), (61, 60, null, 'l'), (70, 70, 70, 'l'), (90, 90, null, 'l'); insert into t2 values (10, 10, 10, 'r'), (30, 30, 30, 'r'), (50, 50, 50, 'r'), (60, 60, 60, 'r'), (61, 60, null, 'r'), (70, 70, 70, 'r'), (71, 70, null, 'r'), (80, 80, 80, 'r'), (81, 80, null, 'r'), (100,100,null, 'r'); select * from t1 where v in(select v from t2 where t1.g=t2.g) is unknown; id g v s 51 50 NULL l 61 60 NULL l drop table t1, t2; # # Bug#33204: INTO is allowed in subselect, causing inconsistent results # CREATE TABLE t1( a INT ); INSERT INTO t1 VALUES (1),(2); CREATE TABLE t2( a INT, b INT ); SELECT * FROM (SELECT a INTO @var FROM t1 WHERE a = 2) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @var FROM t1 WHERE a = 2) t1a' at line 2 SELECT * FROM (SELECT a INTO OUTFILE 'file' FROM t1 WHERE a = 2) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' FROM t1 WHERE a = 2) t1a' at line 2 SELECT * FROM (SELECT a INTO DUMPFILE 'file' FROM t1 WHERE a = 2) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' FROM t1 WHERE a = 2) t1a' at line 2 SELECT * FROM ( SELECT 1 a UNION SELECT a INTO @var FROM t1 WHERE a = 2 ) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @var FROM t1 WHERE a = 2 ) t1a' at line 4 SELECT * FROM ( SELECT 1 a UNION SELECT a INTO OUTFILE 'file' FROM t1 WHERE a = 2 ) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' FROM t1 WHERE a = 2 ) t1a' at line 4 SELECT * FROM ( SELECT 1 a UNION SELECT a INTO DUMPFILE 'file' FROM t1 WHERE a = 2 ) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' FROM t1 WHERE a = 2 ) t1a' at line 4 SELECT * FROM (SELECT a FROM t1 WHERE a = 2) t1a; a 2 SELECT * FROM ( SELECT a FROM t1 WHERE a = 2 UNION SELECT a FROM t1 WHERE a = 2 ) t1a; a 2 SELECT * FROM ( SELECT 1 a UNION SELECT a FROM t1 WHERE a = 2 UNION SELECT a FROM t1 WHERE a = 2 ) t1a; a 1 2 SELECT * FROM ((SELECT 1 a) UNION SELECT 1 a); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 SELECT * FROM (SELECT 1 a UNION (SELECT 1 a)) alias; a 1 SELECT * FROM (SELECT 1 UNION SELECT 1) t1a; 1 1 SELECT * FROM ((SELECT 1 a INTO @a)) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @a)) t1a' at line 1 SELECT * FROM ((SELECT 1 a INTO OUTFILE 'file' )) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' )) t1a' at line 1 SELECT * FROM ((SELECT 1 a INTO DUMPFILE 'file' )) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' )) t1a' at line 1 SELECT * FROM (SELECT 1 a UNION (SELECT 1 a INTO @a)) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @a)) t1a' at line 1 SELECT * FROM (SELECT 1 a UNION (SELECT 1 a INTO DUMPFILE 'file' )) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' )) t1a' at line 1 SELECT * FROM (SELECT 1 a UNION (SELECT 1 a INTO OUTFILE 'file' )) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' )) t1a' at line 1 SELECT * FROM (SELECT 1 a UNION ((SELECT 1 a INTO @a))) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @a))) t1a' at line 1 SELECT * FROM (SELECT 1 a UNION ((SELECT 1 a INTO DUMPFILE 'file' ))) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' ))) t1a' at line 1 SELECT * FROM (SELECT 1 a UNION ((SELECT 1 a INTO OUTFILE 'file' ))) t1a; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' ))) t1a' at line 1 SELECT * FROM (SELECT 1 a ORDER BY a) t1a; a 1 SELECT * FROM (SELECT 1 a UNION SELECT 1 a ORDER BY a) t1a; a 1 SELECT * FROM (SELECT 1 a UNION SELECT 1 a LIMIT 1) t1a; a 1 SELECT * FROM (SELECT 1 a UNION SELECT 1 a ORDER BY a LIMIT 1) t1a; a 1 SELECT * FROM t1 JOIN (SELECT 1 UNION SELECT 1) alias ON 1; a 1 1 1 2 1 SELECT * FROM t1 JOIN ((SELECT 1 UNION SELECT 1)) ON 1; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')) ON 1' at line 1 SELECT * FROM t1 JOIN (t1 t1a UNION SELECT 1) ON 1; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ON 1' at line 1 SELECT * FROM t1 JOIN ((t1 t1a UNION SELECT 1)) ON 1; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')) ON 1' at line 1 SELECT * FROM t1 JOIN (t1 t1a) t1a ON 1; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 't1a ON 1' at line 1 SELECT * FROM t1 JOIN ((t1 t1a)) t1a ON 1; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 't1a ON 1' at line 1 SELECT * FROM t1 JOIN (t1 t1a) ON 1; a a 1 1 2 1 1 2 2 2 SELECT * FROM t1 JOIN ((t1 t1a)) ON 1; a a 1 1 2 1 1 2 2 2 SELECT * FROM (t1 t1a); a 1 2 SELECT * FROM ((t1 t1a)); a 1 2 SELECT * FROM t1 JOIN (SELECT 1 t1a) alias ON 1; a t1a 1 1 2 1 SELECT * FROM t1 JOIN ((SELECT 1 t1a)) alias ON 1; a t1a 1 1 2 1 SELECT * FROM t1 JOIN (SELECT 1 a) a ON 1; a a 1 1 2 1 SELECT * FROM t1 JOIN ((SELECT 1 a)) a ON 1; a a 1 1 2 1 SELECT * FROM (t1 JOIN (SELECT 1) t1a1 ON 1) t1a2; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 't1a2' at line 1 SELECT * FROM t1 WHERE a = ALL ( SELECT 1 ); a 1 SELECT * FROM t1 WHERE a = ALL ( SELECT 1 UNION SELECT 1 ); a 1 SELECT * FROM t1 WHERE a = ANY ( SELECT 3 UNION SELECT 1 ); a 1 SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION SELECT 1 INTO @a); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @a)' at line 1 SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION SELECT 1 INTO OUTFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1 SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION SELECT 1 INTO DUMPFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1 SELECT * FROM t1 WHERE a = ( SELECT 1 ); a 1 SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 ); a 1 SELECT * FROM t1 WHERE a = ( SELECT 1 INTO @a); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @a)' at line 1 SELECT * FROM t1 WHERE a = ( SELECT 1 INTO OUTFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1 SELECT * FROM t1 WHERE a = ( SELECT 1 INTO DUMPFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1 SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 INTO @a); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @a)' at line 1 SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 INTO OUTFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1 SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 INTO DUMPFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1 SELECT ( SELECT 1 INTO @v ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @v )' at line 1 SELECT ( SELECT 1 INTO OUTFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1 SELECT ( SELECT 1 INTO DUMPFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1 SELECT ( SELECT 1 UNION SELECT 1 INTO @v ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @v )' at line 1 SELECT ( SELECT 1 UNION SELECT 1 INTO OUTFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1 SELECT ( SELECT 1 UNION SELECT 1 INTO DUMPFILE 'file' ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1 SELECT ( SELECT a FROM t1 WHERE a = 1 ), a FROM t1; ( SELECT a FROM t1 WHERE a = 1 ) a 1 1 1 2 SELECT ( SELECT a FROM t1 WHERE a = 1 UNION SELECT 1 ), a FROM t1; ( SELECT a FROM t1 WHERE a = 1 UNION SELECT 1 ) a 1 1 1 2 SELECT * FROM t2 WHERE (a, b) IN (SELECT a, b FROM t2); a b SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 )' at line 1 ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) UNION SELECT 1' at line 1 SELECT ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1 SELECT ( ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1; ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1' at line 1 SELECT ( SELECT 1 UNION SELECT 1 UNION SELECT 1 ); ( SELECT 1 UNION SELECT 1 UNION SELECT 1 ) 1 SELECT ((SELECT 1 UNION SELECT 1 UNION SELECT 1)); ((SELECT 1 UNION SELECT 1 UNION SELECT 1)) 1 SELECT * FROM ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1 SELECT * FROM ( ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1 ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') UNION SELECT 1 )' at line 1 SELECT * FROM ( SELECT 1 UNION SELECT 1 UNION SELECT 1 ) a; 1 1 SELECT * FROM t1 WHERE a = ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1 SELECT * FROM t1 WHERE a = ALL ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1 SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1 SELECT * FROM t1 WHERE a IN ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1 SELECT * FROM t1 WHERE a = ( ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1 ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 )' at line 1 SELECT * FROM t1 WHERE a = ALL ( ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1 ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) UNION SELECT 1 )' at line 1 SELECT * FROM t1 WHERE a = ANY ( ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1 ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 ) UNION SELECT 1 )' at line 1 SELECT * FROM t1 WHERE a IN ( ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1 ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION SELECT 1 )' at line 1 SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 UNION SELECT 1 ); a 1 SELECT * FROM t1 WHERE a = ALL ( SELECT 1 UNION SELECT 1 UNION SELECT 1 ); a 1 SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION SELECT 1 UNION SELECT 1 ); a 1 SELECT * FROM t1 WHERE a IN ( SELECT 1 UNION SELECT 1 UNION SELECT 1 ); a 1 SELECT * FROM t1 WHERE EXISTS ( SELECT 1 UNION SELECT 1 INTO @v ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @v )' at line 1 SELECT EXISTS(SELECT 1+1); EXISTS(SELECT 1+1) 1 SELECT EXISTS(SELECT 1+1 INTO @test); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @test)' at line 1 SELECT * FROM t1 WHERE a IN ( SELECT 1 UNION SELECT 1 INTO @v ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @v )' at line 1 SELECT * FROM t1 WHERE EXISTS ( SELECT 1 INTO @v ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @v )' at line 1 SELECT * FROM t1 WHERE a IN ( SELECT 1 INTO @v ); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO @v )' at line 1 DROP TABLE t1, t2; CREATE TABLE t1 (a ENUM('rainbow')); INSERT INTO t1 VALUES (),(),(),(),(); SELECT 1 FROM t1 GROUP BY (SELECT 1 FROM t1 ORDER BY AVG(LAST_INSERT_ID())); 1 1 DROP TABLE t1; CREATE TABLE t1 (a LONGBLOB); INSERT INTO t1 SET a = 'aaaa'; INSERT INTO t1 SET a = 'aaaa'; SELECT 1 FROM t1 GROUP BY (SELECT LAST_INSERT_ID() FROM t1 ORDER BY MIN(a) ASC LIMIT 1); 1 1 DROP TABLE t1; # # Bug #49512 : subquery with aggregate function crash # subselect_single_select_engine::exec() CREATE TABLE t1(a INT); INSERT INTO t1 VALUES(); # should not crash SELECT 1 FROM t1 WHERE a <> SOME ( SELECT MAX((SELECT a FROM t1 LIMIT 1)) AS d FROM t1,t1 a ); 1 DROP TABLE t1; # # Bug #45989 take 2 : memory leak after explain encounters an # error in the query # CREATE TABLE t1(a LONGTEXT); INSERT INTO t1 VALUES (repeat('a',@@global.max_allowed_packet)); INSERT INTO t1 VALUES (repeat('b',@@global.max_allowed_packet)); EXPLAIN EXTENDED SELECT DISTINCT 1 FROM t1, (SELECT a AS away FROM t1 GROUP BY a WITH ROLLUP) AS d1 WHERE t1.a = d1.a; ERROR 42S22: Unknown column 'd1.a' in 'where clause' EXPLAIN EXTENDED SELECT DISTINCT 1 FROM t1, (SELECT DISTINCTROW a AS away FROM t1 GROUP BY a WITH ROLLUP) AS d1 WHERE t1.a = d1.a; ERROR HY000: Incorrect usage of WITH ROLLUP and DISTINCT DROP TABLE t1; create table t0 (a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1 ( a int(11) default null, b int(11) default null, key (a) ); insert into t1 select A.a+10*(B.a+10*C.a),A.a+10*(B.a+10*C.a) from t0 A, t0 B, t0 C; create table t2 (a int(11) default null); insert into t2 values (0),(1); create table t3 (a int(11) default null); insert into t3 values (0),(1); create table t4 (a int(11) default null); insert into t4 values (0),(1); create table t5 (a int(11) default null); insert into t5 values (0),(1),(0),(1); select * from t2, t3 where t2.a < 10 and t3.a+1 = 2 and t3.a in (select t1.b from t1 where t1.a+1=t1.a+1 and t1.a < (select t4.a+10 from t4, t5 limit 2)); ERROR 21000: Subquery returns more than 1 row drop table t0, t1, t2, t3, t4, t5; # # BUG#48177 - SELECTs with NOT IN subqueries containing NULL # values return too many records # CREATE TABLE t1 ( i1 int DEFAULT NULL, i2 int DEFAULT NULL ) ; INSERT INTO t1 VALUES (1, NULL); INSERT INTO t1 VALUES (2, 3); INSERT INTO t1 VALUES (4, NULL); INSERT INTO t1 VALUES (4, 0); INSERT INTO t1 VALUES (NULL, NULL); CREATE TABLE t2 ( i1 int DEFAULT NULL, i2 int DEFAULT NULL ) ; INSERT INTO t2 VALUES (4, NULL); INSERT INTO t2 VALUES (5, 0); Data in t1 SELECT i1, i2 FROM t1; i1 i2 1 NULL 2 3 4 NULL 4 0 NULL NULL Data in subquery (should be filtered out) SELECT i1, i2 FROM t2 ORDER BY i1; i1 i2 4 NULL 5 0 FLUSH STATUS; SELECT i1, i2 FROM t1 WHERE (i1, i2) NOT IN (SELECT i1, i2 FROM t2); i1 i2 1 NULL 2 3 # Check that the subquery only has to be evaluated once # for all-NULL values even though there are two (NULL,NULL) records # Baseline: SHOW STATUS LIKE '%Handler_read_rnd_next'; Variable_name Value Handler_read_rnd_next 17 INSERT INTO t1 VALUES (NULL, NULL); FLUSH STATUS; SELECT i1, i2 FROM t1 WHERE (i1, i2) NOT IN (SELECT i1, i2 FROM t2); i1 i2 1 NULL 2 3 # Handler_read_rnd_next should be one more than baseline # (read record from t1, but do not read from t2) SHOW STATUS LIKE '%Handler_read_rnd_next'; Variable_name Value Handler_read_rnd_next 18 DROP TABLE t1,t2; # # Bug#54568: create view cause Assertion failed: 0, # file .\item_subselect.cc, line 836 # EXPLAIN SELECT 1 LIKE ( 1 IN ( SELECT 1 ) ); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1249 Select 2 was reduced during optimization DESCRIBE SELECT 1 LIKE ( 1 IN ( SELECT 1 ) ); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1249 Select 2 was reduced during optimization # None of the below should crash CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) ); CREATE VIEW v2 AS SELECT 1 LIKE '%' ESCAPE ( 1 IN ( SELECT 1 ) ); DROP VIEW v1, v2; Set up test tables. CREATE TABLE t1 ( t1_id INT UNSIGNED, PRIMARY KEY(t1_id) ) Engine=MyISAM; INSERT INTO t1 (t1_id) VALUES (1), (2), (3), (4), (5); CREATE TABLE t2 SELECT * FROM t1; CREATE TABLE t3 ( t3_id INT UNSIGNED AUTO_INCREMENT, t1_id INT UNSIGNED, amount DECIMAL(16,2), PRIMARY KEY(t3_id), KEY(t1_id) ) Engine=MyISAM; INSERT INTO t3 (t1_id, t3_id, amount) VALUES (1, 1, 100.00), (2, 2, 200.00), (4, 4, 400.00); This is the 'inner query' running by itself. Produces correct results. SELECT t1.t1_id, IFNULL((SELECT SUM(amount) FROM t3 WHERE t3.t1_id=t1.t1_id), 0) AS total_amount FROM t1 LEFT JOIN t2 ON t2.t1_id=t1.t1_id GROUP BY t1.t1_id ; t1_id total_amount 1 100.00 2 200.00 3 0.00 4 400.00 5 0.00 SELECT * FROM (the same inner query) Produces correct results. SELECT * FROM ( SELECT t1.t1_id, IFNULL((SELECT SUM(amount) FROM t3 WHERE t3.t1_id=t1.t1_id), 0) AS total_amount FROM t1 LEFT JOIN t2 ON t2.t1_id=t1.t1_id GROUP BY t1.t1_id ) AS t; t1_id total_amount 1 100.00 2 200.00 3 0.00 4 400.00 5 0.00 Now make t2.t1_id part of a key. ALTER TABLE t2 ADD PRIMARY KEY(t1_id); Same inner query by itself. Still correct results. SELECT t1.t1_id, IFNULL((SELECT SUM(amount) FROM t3 WHERE t3.t1_id=t1.t1_id), 0) AS total_amount FROM t1 LEFT JOIN t2 ON t2.t1_id=t1.t1_id GROUP BY t1.t1_id; t1_id total_amount 1 100.00 2 200.00 3 0 4 400.00 5 0 SELECT * FROM (the same inner query), now with indexes on the LEFT JOIN SELECT * FROM ( SELECT t1.t1_id, IFNULL((SELECT SUM(amount) FROM t3 WHERE t3.t1_id=t1.t1_id), 0) AS total_amount FROM t1 LEFT JOIN t2 ON t2.t1_id=t1.t1_id GROUP BY t1.t1_id ) AS t; t1_id total_amount 1 100.00 2 200.00 3 0.00 4 400.00 5 0.00 DROP TABLE t3; DROP TABLE t2; DROP TABLE t1; create table t0 (a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1 ( a int(11) default null, b int(11) default null, key (a) ); insert into t1 select A.a+10*(B.a+10*C.a),A.a+10*(B.a+10*C.a) from t0 A, t0 B, t0 C; create table t2 (a int(11) default null); insert into t2 values (0),(1); create table t3 (a int(11) default null); insert into t3 values (0),(1); create table t4 (a int(11) default null); insert into t4 values (0),(1); create table t5 (a int(11) default null); insert into t5 values (0),(1),(0),(1); select * from t2, t3 where t2.a < 10 and t3.a+1 = 2 and t3.a in (select t1.b from t1 where t1.a+1=t1.a+1 and t1.a < (select t4.a+10 from t4, t5 limit 2)); ERROR 21000: Subquery returns more than 1 row drop table t0, t1, t2, t3, t4, t5; # # BUG#48177 - SELECTs with NOT IN subqueries containing NULL # values return too many records # CREATE TABLE t1 ( i1 int DEFAULT NULL, i2 int DEFAULT NULL ) ; INSERT INTO t1 VALUES (1, NULL); INSERT INTO t1 VALUES (2, 3); INSERT INTO t1 VALUES (4, NULL); INSERT INTO t1 VALUES (4, 0); INSERT INTO t1 VALUES (NULL, NULL); CREATE TABLE t2 ( i1 int DEFAULT NULL, i2 int DEFAULT NULL ) ; INSERT INTO t2 VALUES (4, NULL); INSERT INTO t2 VALUES (5, 0); Data in t1 SELECT i1, i2 FROM t1; i1 i2 1 NULL 2 3 4 NULL 4 0 NULL NULL Data in subquery (should be filtered out) SELECT i1, i2 FROM t2 ORDER BY i1; i1 i2 4 NULL 5 0 FLUSH STATUS; SELECT i1, i2 FROM t1 WHERE (i1, i2) NOT IN (SELECT i1, i2 FROM t2); i1 i2 1 NULL 2 3 # Check that the subquery only has to be evaluated once # for all-NULL values even though there are two (NULL,NULL) records # Baseline: SHOW STATUS LIKE '%Handler_read_rnd_next'; Variable_name Value Handler_read_rnd_next 17 INSERT INTO t1 VALUES (NULL, NULL); FLUSH STATUS; SELECT i1, i2 FROM t1 WHERE (i1, i2) NOT IN (SELECT i1, i2 FROM t2); i1 i2 1 NULL 2 3 # Handler_read_rnd_next should be one more than baseline # (read record from t1, but do not read from t2) SHOW STATUS LIKE '%Handler_read_rnd_next'; Variable_name Value Handler_read_rnd_next 18 DROP TABLE t1,t2; # # Bug #52711: Segfault when doing EXPLAIN SELECT with # union...order by (select... where...) # CREATE TABLE t1 (a VARCHAR(10), FULLTEXT KEY a (a)); INSERT INTO t1 VALUES (1),(2); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1),(2); # Should not crash EXPLAIN SELECT * FROM t2 UNION SELECT * FROM t2 ORDER BY (SELECT * FROM t1 WHERE MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE)); # Should not crash SELECT * FROM t2 UNION SELECT * FROM t2 ORDER BY (SELECT * FROM t1 WHERE MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE)); DROP TABLE t1,t2; # # Bug #58818: Incorrect result for IN/ANY subquery # with HAVING condition # CREATE TABLE t1(i INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t1s(i INT); INSERT INTO t1s VALUES (10), (20), (30); CREATE TABLE t2s(i INT); INSERT INTO t2s VALUES (100), (200), (300); SELECT * FROM t1 WHERE t1.i NOT IN ( SELECT STRAIGHT_JOIN t2s.i FROM t1s LEFT OUTER JOIN t2s ON t2s.i = t1s.i HAVING t2s.i = 999 ); i 1 2 3 SELECT * FROM t1 WHERE t1.I IN ( SELECT STRAIGHT_JOIN t2s.i FROM t1s LEFT OUTER JOIN t2s ON t2s.i = t1s.i HAVING t2s.i = 999 ) IS UNKNOWN; i SELECT * FROM t1 WHERE NOT t1.I = ANY ( SELECT STRAIGHT_JOIN t2s.i FROM t1s LEFT OUTER JOIN t2s ON t2s.i = t1s.i HAVING t2s.i = 999 ); i 1 2 3 SELECT * FROM t1 WHERE t1.i = ANY ( SELECT STRAIGHT_JOIN t2s.i FROM t1s LEFT OUTER JOIN t2s ON t2s.i = t1s.i HAVING t2s.i = 999 ) IS UNKNOWN; i DROP TABLE t1,t1s,t2s; # # Bug #56690 Wrong results with subquery with # GROUP BY inside < ANY clause # CREATE TABLE t1 ( pk INT NOT NULL PRIMARY KEY, number INT, KEY key_number (number) ); INSERT INTO t1 VALUES (8,8); CREATE TABLE t2 ( pk INT NOT NULL PRIMARY KEY, number INT, KEY key_number (number) ); INSERT INTO t2 VALUES (1,2); INSERT INTO t2 VALUES (2,8); INSERT INTO t2 VALUES (3,NULL); INSERT INTO t2 VALUES (4,166); SELECT * FROM t1 WHERE t1.number < ANY(SELECT number FROM t2 GROUP BY number); pk number 8 8 SELECT * FROM t1 WHERE t1.number < ANY(SELECT number FROM t2); pk number 8 8 DROP TABLE t1,t2; End of 5.1 tests # # BUG#50257: Missing info in REF column of the EXPLAIN # lines for subselects # CREATE TABLE t1 (a INT, b INT, INDEX (a)); INSERT INTO t1 VALUES (3, 10), (2, 20), (7, 10), (5, 20); EXPLAIN SELECT * FROM (SELECT * FROM t1 WHERE a=7) t; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 NULL 2 DERIVED t1 ref a a 5 const 1 NULL EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 4 NULL 2 SUBQUERY t1 ref a a 5 const 1 Using index DROP TABLE t1; # # BUG#52317: Assertion failing in Field_varstring::store() # at field.cc:6833 # CREATE TABLE t1 (i INTEGER); INSERT INTO t1 VALUES (1); CREATE TABLE t2 (i INTEGER, KEY k(i)); INSERT INTO t2 VALUES (1), (2); EXPLAIN SELECT i FROM t1 WHERE (1) NOT IN (SELECT i FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 2 DEPENDENT SUBQUERY t2 index_subquery k k 5 const 2 Using index DROP TABLE t2; DROP TABLE t1; # # Bug #11765713 58705: # OPTIMIZER LET ENGINE DEPEND ON UNINITIALIZED VALUES # CREATED BY OPT_SUM_QUERY # CREATE TABLE t1(a INT NOT NULL, KEY (a)); INSERT INTO t1 VALUES (0), (1); SELECT 1 as foo FROM t1 WHERE a < SOME (SELECT a FROM t1 WHERE a <=> (SELECT a FROM t1) ); ERROR 21000: Subquery returns more than 1 row SELECT 1 as foo FROM t1 WHERE a < SOME (SELECT a FROM t1 WHERE a <=> (SELECT a FROM t1 where a is null) ); foo DROP TABLE t1; # # Bug #57704: Cleanup code dies with void TABLE::set_keyread(bool): # Assertion `file' failed. # CREATE TABLE t1 (a INT); SELECT 1 FROM (SELECT ROW( (SELECT 1 FROM t1 RIGHT JOIN (SELECT 1 FROM t1, t1 t2) AS d ON 1), 1) FROM t1) AS e; ERROR 21000: Operand should contain 1 column(s) DROP TABLE t1; # # Bug#11764086: Null left operand to NOT IN in WHERE clause # behaves differently than real NULL # CREATE TABLE parent (id int); INSERT INTO parent VALUES (1), (2); CREATE TABLE child (parent_id int, other int); INSERT INTO child VALUES (1,NULL); # Offending query (c.parent_id is NULL for null-complemented rows only) SELECT p.id, c.parent_id FROM parent p LEFT JOIN child c ON p.id = c.parent_id WHERE c.parent_id NOT IN ( SELECT parent_id FROM child WHERE parent_id = 3 ); id parent_id 1 1 2 NULL # Some syntactic variations with IS FALSE and IS NOT TRUE SELECT p.id, c.parent_id FROM parent p LEFT JOIN child c ON p.id = c.parent_id WHERE c.parent_id IN ( SELECT parent_id FROM child WHERE parent_id = 3 ) IS NOT TRUE; id parent_id 1 1 2 NULL SELECT p.id, c.parent_id FROM parent p LEFT JOIN child c ON p.id = c.parent_id WHERE c.parent_id IN ( SELECT parent_id FROM child WHERE parent_id = 3 ) IS FALSE; id parent_id 1 1 2 NULL DROP TABLE parent, child; # End of test for bug#11764086. End of 5.5 tests. # # BUG#48920: COUNT DISTINCT returns 1 for NULL values when in a subquery # in the select list # CREATE TABLE t1 ( i int(11) DEFAULT NULL, v varchar(1) DEFAULT NULL ); INSERT INTO t1 VALUES (8,'v'); INSERT INTO t1 VALUES (9,'r'); INSERT INTO t1 VALUES (NULL,'y'); CREATE TABLE t2 ( i int(11) DEFAULT NULL, v varchar(1) DEFAULT NULL, KEY i_key (i) ); INSERT INTO t2 VALUES (NULL,'r'); INSERT INTO t2 VALUES (0,'c'); INSERT INTO t2 VALUES (0,'o'); INSERT INTO t2 VALUES (2,'v'); INSERT INTO t2 VALUES (7,'c'); SELECT i, v, (SELECT COUNT(DISTINCT i) FROM t1 WHERE v = t2.v) as subsel FROM t2; i v subsel NULL r 1 0 c 0 0 o 0 2 v 1 7 c 0 EXPLAIN EXTENDED SELECT i, v, (SELECT COUNT(DISTINCT i) FROM t1 WHERE v = t2.v) as subsel FROM t2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 NULL 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Note 1276 Field or reference 'test.t2.v' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t2`.`i` AS `i`,`test`.`t2`.`v` AS `v`,(/* select#2 */ select count(distinct `test`.`t1`.`i`) from `test`.`t1` where (`test`.`t1`.`v` = `test`.`t2`.`v`)) AS `subsel` from `test`.`t2` DROP TABLE t1,t2; # # BUG#50257: Missing info in REF column of the EXPLAIN # lines for subselects # CREATE TABLE t1 (a INT, b INT, INDEX (a)); INSERT INTO t1 VALUES (3, 10), (2, 20), (7, 10), (5, 20); EXPLAIN SELECT * FROM (SELECT * FROM t1 WHERE a=7) t; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 NULL 2 DERIVED t1 ref a a 5 const 1 NULL EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 4 NULL 2 SUBQUERY t1 ref a a 5 const 1 Using index DROP TABLE t1; # # BUG#58561: Server Crash with correlated subquery and MyISAM tables # CREATE TABLE cc ( pk INT, col_int_key INT, col_varchar_key VARCHAR(1), PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ) ENGINE=MyISAM; INSERT INTO cc VALUES (10,7,'v'); INSERT INTO cc VALUES (11,1,'r'); CREATE TABLE bb ( pk INT, col_date_key DATE, PRIMARY KEY (pk), KEY col_date_key (col_date_key) ) ENGINE=MyISAM; INSERT INTO bb VALUES (10,'2002-02-21'); CREATE TABLE c ( pk INT, col_int_key INT, col_varchar_key VARCHAR(1), PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ) ENGINE=MyISAM; INSERT INTO c VALUES (1,NULL,'w'); INSERT INTO c VALUES (19,NULL,'f'); CREATE TABLE b ( pk INT, col_int_key INT, col_varchar_key VARCHAR(1), PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ) ENGINE=MyISAM; INSERT INTO b VALUES (1,7,'f'); SELECT col_int_key FROM b granparent1 WHERE (col_int_key, col_int_key) IN ( SELECT parent1.pk, parent1.pk FROM bb parent1 JOIN cc parent2 ON parent2.col_varchar_key = parent2.col_varchar_key WHERE granparent1.col_varchar_key IN ( SELECT col_varchar_key FROM c) AND parent1.pk = granparent1.col_int_key ORDER BY parent1.col_date_key ); col_int_key DROP TABLE bb, b, cc, c; End of 5.6 tests # # BUG#46743 "Azalea processing correlated, aggregate SELECT # subqueries incorrectly" # CREATE TABLE t1 (c int); INSERT INTO t1 VALUES (NULL); CREATE TABLE t2 (d int , KEY (d)); INSERT INTO t2 VALUES (NULL),(NULL); 0 rows in subquery SELECT 1 AS RESULT FROM t2,t1 WHERE d = c; RESULT base query SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 ; RESULT NULL EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 ; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00 NULL 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select (/* select#2 */ select 1 from `test`.`t2` where 0) AS `RESULT` from dual first equivalent variant SELECT (SELECT 1 FROM t2 WHERE d = IFNULL(c,NULL)) AS RESULT FROM t1 GROUP BY c ; RESULT NULL EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = IFNULL(c,NULL)) AS RESULT FROM t1 GROUP BY c; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00 NULL 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select (/* select#2 */ select 1 from `test`.`t2` where 0) AS `RESULT` from dual group by NULL second equivalent variant SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 GROUP BY c ; RESULT NULL EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 GROUP BY c ; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00 NULL 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select (/* select#2 */ select 1 from `test`.`t2` where 0) AS `RESULT` from dual group by NULL DROP TABLE t1,t2; BUG#37842: Assertion in DsMrr_impl::dsmrr_init, at handler.cc:4307 CREATE TABLE t1 ( `pk` int(11) NOT NULL AUTO_INCREMENT, `int_key` int(11) DEFAULT NULL, PRIMARY KEY (`pk`), KEY `int_key` (`int_key`) ) ENGINE=MyISAM; INSERT INTO t1 VALUES (1,9),(2,3),(3,8),(4,6),(5,9),(6,5),(7,5),(8,9),(9,1),(10,10); SELECT `pk` FROM t1 AS OUTR WHERE `int_key` = ALL ( SELECT `int_key` FROM t1 AS INNR WHERE INNR . `pk` >= 9 ); pk DROP TABLE t1; # # Bug#53236 Segfault in DTCollation::set(DTCollation&) # CREATE TABLE t1 ( pk INTEGER AUTO_INCREMENT, col_varchar VARCHAR(1), PRIMARY KEY (pk) ) ; INSERT INTO t1 (col_varchar) VALUES ('w'), ('m') ; SELECT table1.pk FROM ( t1 AS table1 JOIN t1 AS table2 ON (table1.col_varchar = table2.col_varchar) ) WHERE ( 1, 2 ) IN ( SELECT SUBQUERY1_t1.pk AS SUBQUERY1_field1, SUBQUERY1_t1.pk AS SUBQUERY1_field2 FROM ( t1 AS SUBQUERY1_t1 JOIN t1 AS SUBQUERY1_t2 ON (SUBQUERY1_t2.col_varchar = SUBQUERY1_t1.col_varchar) ) ) ; pk drop table t1; # # Bug#58207: invalid memory reads when using default column value and # tmptable needed # CREATE TABLE t(a VARCHAR(245) DEFAULT 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'); INSERT INTO t VALUES (''),(''),(''),(''),(''),(''),(''),(''),(''),(''),(''); SELECT * FROM (SELECT default(a) FROM t GROUP BY a) d; default(a) aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa DROP TABLE t; # # Bug 11765699 - 58690: !TABLE || (!TABLE->READ_SET || # BITMAP_IS_SET(TABLE->READ_SET, FIELD_INDEX # CREATE TABLE t1(a INT); INSERT INTO t1 VALUES (0), (1); CREATE TABLE t2( b TEXT, c INT, PRIMARY KEY (b(1)) ); INSERT INTO t2 VALUES ('a', 2), ('b', 3); SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t2 WHERE b = (SELECT 1 FROM t1 t11 WHERE c = 1 OR t1.a = 1 AND 1 = 2) ORDER BY b ); 1 SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t2 WHERE b = (SELECT 1 FROM t1 t11 WHERE c = 1 OR t1.a = 1 AND 1 = 2) GROUP BY b ); 1 DROP TABLE t1, t2; # # BUG#12616253 - WRONG RESULT WITH EXISTS(SUBQUERY) (MISSING ROWS) # CREATE TABLE t1 (f1 varchar(1)); INSERT INTO t1 VALUES ('v'),('s'); CREATE TABLE t2 (f1_key varchar(1), KEY (f1_key)); INSERT INTO t2 VALUES ('j'),('v'),('c'),('m'),('d'), ('d'),('y'),('t'),('d'),('s'); SELECT table1.f1, table2.f1_key FROM t1 AS table1, t2 AS table2 WHERE EXISTS ( SELECT DISTINCT f1_key FROM t2 WHERE f1_key != table2.f1_key AND f1_key >= table1.f1 ); f1 f1_key v c s c v d s d v d s d v d s d v j s j v m s m v s s s v t s t v v s v v y s y explain SELECT table1.f1, table2.f1_key FROM t1 AS table1, t2 AS table2 WHERE EXISTS ( SELECT DISTINCT f1_key FROM t2 WHERE f1_key != table2.f1_key AND f1_key >= table1.f1 ); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY table1 ALL NULL NULL NULL NULL 2 NULL 1 PRIMARY table2 index NULL f1_key 4 NULL 10 Using where; Using index; Using join buffer (Block Nested Loop) 2 DEPENDENT SUBQUERY t2 ALL f1_key NULL NULL NULL 10 Range checked for each record (index map: 0x1) DROP TABLE t1,t2; # # BUG#12616477 - 0 VS NULL DIFFERENCES WITH OUTER JOIN, SUBQUERY # CREATE TABLE t1 ( col_int_key int, col_varchar_key varchar(1), col_varchar_nokey varchar(1), KEY (col_int_key) ); INSERT INTO t1 VALUES (224,'p','p'),(9,'e','e'); CREATE TABLE t3 ( col_int_key int, col_varchar_key varchar(1), KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key)) ; INSERT INTO t3 VALUES (4,'p'),(8,'e'),(10,'a'); SELECT t1f.*,t3f.*,( SELECT MIN(t3s.col_int_key) FROM t3 AS t3s JOIN t1 AS t1s ON t1s.col_int_key = 9 and t1s.col_varchar_key = 'e' WHERE 'e' <> t1f.col_varchar_nokey ) FROM t1 AS t1f STRAIGHT_JOIN t3 AS t3f; col_int_key col_varchar_key col_varchar_nokey col_int_key col_varchar_key ( SELECT MIN(t3s.col_int_key) FROM t3 AS t3s JOIN t1 AS t1s ON t1s.col_int_key = 9 and t1s.col_varchar_key = 'e' WHERE 'e' <> t1f.col_varchar_nokey ) 224 p p 10 a 4 9 e e 10 a NULL 224 p p 8 e 4 9 e e 8 e NULL 224 p p 4 p 4 9 e e 4 p NULL explain SELECT t1f.*,t3f.*,( SELECT MIN(t3s.col_int_key) FROM t3 AS t3s JOIN t1 AS t1s ON t1s.col_int_key = 9 and t1s.col_varchar_key = 'e' WHERE 'e' <> t1f.col_varchar_nokey ) FROM t1 AS t1f STRAIGHT_JOIN t3 AS t3f; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1f ALL NULL NULL NULL NULL 2 NULL 1 PRIMARY t3f index NULL col_varchar_key 9 NULL 3 Using index; Using join buffer (Block Nested Loop) 2 DEPENDENT SUBQUERY t1s ref col_int_key col_int_key 5 const 1 Using where 2 DEPENDENT SUBQUERY t3s index NULL col_int_key 5 NULL 3 Using index; Using join buffer (Block Nested Loop) DROP TABLE t1,t3; # # Bug#12795555: Missing rows with ALL/ANY subquery # CREATE TABLE t1 (f1 INT); INSERT INTO t1 VAlUES (NULL),(1),(NULL),(2); SELECT f1 FROM t1 WHERE f1 < ALL (SELECT 1 FROM DUAL WHERE 0); f1 NULL 1 NULL 2 DROP TABLE t1; CREATE TABLE t1 (k VARCHAR(1), KEY k(k)); INSERT INTO t1 VALUES ('r'), (NULL), (NULL); CREATE TABLE t2 (c VARCHAR(1)); INSERT INTO t2 VALUES ('g'), (NULL); CREATE TABLE t3 (c VARCHAR(1)); SELECT COUNT(*) FROM t1 JOIN t2 WHERE t1.k < ALL( SELECT c FROM t3 ); COUNT(*) 6 DROP TABLE t1, t2, t3; # # Bug#12838171: 51VS56: TRANSFORMED IN()+SUBQ QUERY # PRODUCES EMPTY RESULT ON 5.6, 1 ROW ON 5.1 # CREATE TABLE ot ( col_int_nokey int(11), col_varchar_nokey varchar(1) ) ; INSERT INTO ot VALUES (1,'x'); CREATE TABLE it ( col_int_key int(11), col_varchar_key varchar(1), KEY idx_cvk_cik (col_varchar_key,col_int_key) ) ; INSERT INTO it VALUES (NULL,'x'), (NULL,'f'); SELECT col_int_nokey FROM ot WHERE col_varchar_nokey IN (SELECT col_varchar_key FROM it WHERE col_int_key IS NULL); col_int_nokey 1 EXPLAIN EXTENDED SELECT col_int_nokey FROM ot WHERE col_varchar_nokey IN (SELECT col_varchar_key FROM it WHERE col_int_key IS NULL); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ot system NULL NULL NULL NULL 1 100.00 NULL 1 SIMPLE it ref idx_cvk_cik idx_cvk_cik 9 const,const 1 100.00 Using where; Using index; FirstMatch(ot) Warnings: Note 1003 /* select#1 */ select '1' AS `col_int_nokey` from (`test`.`it`) where ((`test`.`it`.`col_varchar_key` = 'x') and isnull(`test`.`it`.`col_int_key`)) SELECT col_int_nokey FROM ot WHERE col_varchar_nokey IN (SELECT col_varchar_key FROM it WHERE coalesce(col_int_nokey, 1) ); col_int_nokey 1 EXPLAIN EXTENDED SELECT col_int_nokey FROM ot WHERE col_varchar_nokey IN (SELECT col_varchar_key FROM it WHERE coalesce(col_int_nokey, 1) ); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ot system NULL NULL NULL NULL 1 100.00 NULL 1 SIMPLE it ref idx_cvk_cik idx_cvk_cik 4 const 1 100.00 Using index; FirstMatch(ot) Warnings: Note 1276 Field or reference 'test.ot.col_int_nokey' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select '1' AS `col_int_nokey` from (`test`.`it`) where ((`test`.`it`.`col_varchar_key` = 'x') and coalesce('1',1)) DROP TABLE it; CREATE TABLE it ( col_int_key int(11), col_varchar_key varchar(1), col_varchar_key2 varchar(1), KEY idx_cvk_cvk2_cik (col_varchar_key, col_varchar_key2, col_int_key), KEY idx_cvk_cik (col_varchar_key, col_int_key) ); INSERT INTO it VALUES (NULL,'x','x'), (NULL,'f','f'); SELECT col_int_nokey FROM ot WHERE (col_varchar_nokey, 'x') IN (SELECT col_varchar_key, col_varchar_key2 FROM it WHERE col_int_key IS NULL); col_int_nokey 1 EXPLAIN EXTENDED SELECT col_int_nokey FROM ot WHERE (col_varchar_nokey, 'x') IN (SELECT col_varchar_key, col_varchar_key2 FROM it WHERE col_int_key IS NULL); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ot system NULL NULL NULL NULL 1 100.00 NULL 1 SIMPLE it ref idx_cvk_cvk2_cik,idx_cvk_cik idx_cvk_cvk2_cik 13 const,const,const 1 100.00 Using where; Using index; FirstMatch(ot) Warnings: Note 1003 /* select#1 */ select '1' AS `col_int_nokey` from (`test`.`it`) where ((`test`.`it`.`col_varchar_key2` = 'x') and (`test`.`it`.`col_varchar_key` = 'x') and isnull(`test`.`it`.`col_int_key`)) DROP TABLE it, ot; # # Bug #11829691: Pure virtual method called in Item_bool_func2::fix...() # CREATE TABLE t1(a INTEGER); CREATE TABLE t2(b INTEGER); PREPARE stmt FROM " SELECT SUM(b) FROM t2 GROUP BY b HAVING b IN (SELECT b FROM t1)"; EXECUTE stmt; SUM(b) EXECUTE stmt; SUM(b) DEALLOCATE PREPARE stmt; DROP TABLE t1, t2; # # Bug #13595212 EXTRA ROWS RETURNED ON RIGHT JOIN WITH VIEW AND # IN-SUBQUERY IN WHERE # CREATE TABLE t1 ( pk int(11) NOT NULL AUTO_INCREMENT, col_int_key int(11) NOT NULL, col_varchar_key varchar(1) NOT NULL, col_varchar_nokey varchar(1) NOT NULL, PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ); INSERT INTO t1 VALUES (1,0,'j','j'),(2,8,'v','v'), (3,1,'c','c'),(4,8,'m','m'),(5,9,'d','d'); CREATE VIEW v1 AS SELECT * FROM t1; EXPLAIN EXTENDED SELECT alias2.col_varchar_nokey FROM v1 AS alias1 RIGHT JOIN t1 AS alias2 ON 1 WHERE alias2.col_varchar_key IN ( SELECT sq2_alias1.col_varchar_nokey FROM v1 AS sq2_alias1 LEFT JOIN t1 AS sq2_alias2 ON (sq2_alias2.col_int_key = sq2_alias1.pk) WHERE sq2_alias1.pk != alias1.col_int_key AND sq2_alias1.col_varchar_key > alias1.col_varchar_key ) ; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL col_varchar_key NULL NULL NULL 5 100.00 Start temporary 1 SIMPLE alias2 ALL col_varchar_key NULL NULL NULL 5 80.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE sq2_alias2 index col_int_key col_int_key 4 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) 1 SIMPLE t1 ALL col_varchar_key NULL NULL NULL 5 100.00 Range checked for each record (index map: 0x4); End temporary Warnings: Note 1276 Field or reference 'alias1.col_int_key' of SELECT #2 was resolved in SELECT #1 Note 1276 Field or reference 'alias1.col_varchar_key' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from `test`.`t1` `alias2` semi join (`test`.`t1` left join `test`.`t1` `sq2_alias2` on((`test`.`sq2_alias2`.`col_int_key` = `test`.`t1`.`pk`))) join `test`.`t1` where ((`test`.`alias2`.`col_varchar_key` = `test`.`t1`.`col_varchar_nokey`) and (`test`.`t1`.`pk` <> `test`.`t1`.`col_int_key`) and (`test`.`t1`.`col_varchar_key` > `test`.`t1`.`col_varchar_key`)) SELECT alias2.col_varchar_nokey FROM v1 AS alias1 RIGHT JOIN t1 AS alias2 ON 1 WHERE alias2.col_varchar_key IN ( SELECT sq2_alias1.col_varchar_nokey FROM v1 AS sq2_alias1 LEFT JOIN t1 AS sq2_alias2 ON (sq2_alias2.col_int_key = sq2_alias1.pk) WHERE sq2_alias1.pk != alias1.col_int_key AND sq2_alias1.col_varchar_key > alias1.col_varchar_key ) ; col_varchar_nokey d j m m m v v v v CREATE VIEW v2 AS SELECT alias2.col_varchar_nokey FROM v1 AS alias1 RIGHT JOIN t1 AS alias2 ON 1 WHERE alias2.col_varchar_key IN ( SELECT sq2_alias1.col_varchar_nokey FROM v1 AS sq2_alias1 LEFT JOIN t1 AS sq2_alias2 ON (sq2_alias2.col_int_key = sq2_alias1.pk) WHERE sq2_alias1.pk != alias1.col_int_key AND sq2_alias1.col_varchar_key > alias1.col_varchar_key ) ; EXPLAIN EXTENDED SELECT * FROM v2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL col_varchar_key NULL NULL NULL 5 100.00 Start temporary 1 SIMPLE alias2 ALL col_varchar_key NULL NULL NULL 5 80.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE sq2_alias2 index col_int_key col_int_key 4 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) 1 SIMPLE t1 ALL col_varchar_key NULL NULL NULL 5 100.00 Range checked for each record (index map: 0x4); End temporary Warnings: Note 1276 Field or reference 'alias1.col_int_key' of SELECT #3 was resolved in SELECT #1 Note 1276 Field or reference 'alias1.col_varchar_key' of SELECT #3 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from `test`.`t1` `alias2` semi join (`test`.`t1` left join `test`.`t1` `sq2_alias2` on((`sq2_alias2`.`col_int_key` = `test`.`t1`.`pk`))) join `test`.`t1` where ((`test`.`alias2`.`col_varchar_key` = `test`.`t1`.`col_varchar_nokey`) and (`test`.`t1`.`pk` <> `t1`.`col_int_key`) and (`test`.`t1`.`col_varchar_key` > `t1`.`col_varchar_key`)) SELECT * FROM v2; col_varchar_nokey d j m m m v v v v EXPLAIN EXTENDED SELECT alias2.col_varchar_nokey FROM t1 AS alias2 LEFT JOIN v1 AS alias1 ON 1 WHERE alias2.col_varchar_key IN ( SELECT sq2_alias1.col_varchar_nokey FROM v1 AS sq2_alias1 LEFT JOIN t1 AS sq2_alias2 ON (sq2_alias2.col_int_key = sq2_alias1.pk) WHERE sq2_alias1.pk != alias1.col_int_key AND sq2_alias1.col_varchar_key > alias1.col_varchar_key ); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL col_varchar_key NULL NULL NULL 5 100.00 Start temporary 1 SIMPLE alias2 ALL col_varchar_key NULL NULL NULL 5 80.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE sq2_alias2 index col_int_key col_int_key 4 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) 1 SIMPLE t1 ALL col_varchar_key NULL NULL NULL 5 100.00 Range checked for each record (index map: 0x4); End temporary Warnings: Note 1276 Field or reference 'alias1.col_int_key' of SELECT #2 was resolved in SELECT #1 Note 1276 Field or reference 'alias1.col_varchar_key' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`alias2`.`col_varchar_nokey` AS `col_varchar_nokey` from `test`.`t1` `alias2` semi join (`test`.`t1` left join `test`.`t1` `sq2_alias2` on((`sq2_alias2`.`col_int_key` = `test`.`t1`.`pk`))) join `test`.`t1` where ((`test`.`alias2`.`col_varchar_key` = `test`.`t1`.`col_varchar_nokey`) and (`test`.`t1`.`pk` <> `t1`.`col_int_key`) and (`test`.`t1`.`col_varchar_key` > `t1`.`col_varchar_key`)) SELECT alias2.col_varchar_nokey FROM t1 AS alias2 LEFT JOIN v1 AS alias1 ON 1 WHERE alias2.col_varchar_key IN ( SELECT sq2_alias1.col_varchar_nokey FROM v1 AS sq2_alias1 LEFT JOIN t1 AS sq2_alias2 ON (sq2_alias2.col_int_key = sq2_alias1.pk) WHERE sq2_alias1.pk != alias1.col_int_key AND sq2_alias1.col_varchar_key > alias1.col_varchar_key ); col_varchar_nokey d j m m m v v v v DROP TABLE t1; DROP VIEW v1,v2; # # Bug#13651009 WRONG RESULT FROM DERIVED TABLE IF THE SUBQUERY # HAS AN EMPTY RESULT # CREATE TABLE t1 ( pk int NOT NULL, col_int_nokey int NOT NULL, col_int_key int NOT NULL, col_time_key time NOT NULL, col_varchar_key varchar(1) NOT NULL, col_varchar_nokey varchar(1) NOT NULL, PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_time_key (col_time_key), KEY col_varchar_key (col_varchar_key,col_int_key) ) ENGINE=MyISAM; CREATE TABLE t2 ( pk int NOT NULL AUTO_INCREMENT, col_int_nokey int NOT NULL, col_int_key int NOT NULL, col_time_key time NOT NULL, col_varchar_key varchar(1) NOT NULL, col_varchar_nokey varchar(1) NOT NULL, PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_time_key (col_time_key), KEY col_varchar_key (col_varchar_key,col_int_key) ) ENGINE=MyISAM; INSERT INTO t2 VALUES (1,4,4,'00:00:00','b','b'); SET @var2:=4, @var3:=8; Testcase without inner subquery EXPLAIN SELECT @var3:=12, sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR sq4_alias1.col_varchar_key = @var3; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables SELECT @var3:=12, sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR sq4_alias1.col_varchar_key = @var3; @var3:=12 pk col_int_nokey col_int_key col_time_key col_varchar_key col_varchar_nokey SELECT @var3; @var3 8 EXPLAIN SELECT * FROM ( SELECT @var3:=12, sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR sq4_alias1.col_varchar_key = @var3 ) AS alias3; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 0 const row not found 2 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT * FROM ( SELECT @var3:=12, sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR sq4_alias1.col_varchar_key = @var3 ) AS alias3; @var3:=12 pk col_int_nokey col_int_key col_time_key col_varchar_key col_varchar_nokey SELECT @var3; @var3 8 Testcase with inner subquery; crashed WL#6095 SET @var3=8; EXPLAIN SELECT sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key , sq4_alias1.col_varchar_nokey) NOT IN (SELECT c_sq1_alias1.col_varchar_key AS c_sq1_field1, c_sq1_alias1.col_varchar_nokey AS c_sq1_field2 FROM t2 AS c_sq1_alias1 WHERE (c_sq1_alias1.col_int_nokey != @var2 OR c_sq1_alias1.pk != @var3)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 2 UNCACHEABLE SUBQUERY c_sq1_alias1 system PRIMARY,col_varchar_key NULL NULL NULL 1 NULL SELECT sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key , sq4_alias1.col_varchar_nokey) NOT IN (SELECT c_sq1_alias1.col_varchar_key AS c_sq1_field1, c_sq1_alias1.col_varchar_nokey AS c_sq1_field2 FROM t2 AS c_sq1_alias1 WHERE (c_sq1_alias1.col_int_nokey != @var2 OR c_sq1_alias1.pk != @var3)); pk col_int_nokey col_int_key col_time_key col_varchar_key col_varchar_nokey EXPLAIN SELECT * FROM ( SELECT sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key , sq4_alias1.col_varchar_nokey) NOT IN (SELECT c_sq1_alias1.col_varchar_key AS c_sq1_field1, c_sq1_alias1.col_varchar_nokey AS c_sq1_field2 FROM t2 AS c_sq1_alias1 WHERE (c_sq1_alias1.col_int_nokey != @var2 OR c_sq1_alias1.pk != @var3)) ) AS alias3; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 0 const row not found 2 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table 3 UNCACHEABLE SUBQUERY c_sq1_alias1 system PRIMARY,col_varchar_key NULL NULL NULL 1 NULL SELECT * FROM ( SELECT sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key , sq4_alias1.col_varchar_nokey) NOT IN (SELECT c_sq1_alias1.col_varchar_key AS c_sq1_field1, c_sq1_alias1.col_varchar_nokey AS c_sq1_field2 FROM t2 AS c_sq1_alias1 WHERE (c_sq1_alias1.col_int_nokey != @var2 OR c_sq1_alias1.pk != @var3)) ) AS alias3; pk col_int_nokey col_int_key col_time_key col_varchar_key col_varchar_nokey DROP TABLE t1,t2; # # Test that indexsubquery_engine only does one lookup if # the technique is unique_subquery: does not try to read the # next row if the first row failed the subquery's WHERE # condition (here: b=3). # create table t1(a int); insert into t1 values(1),(2); create table t2(a int primary key, b int); insert into t2 values(1,10),(2,10); explain select * from t1 where a in (select a from t2 where b=3); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where 1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where flush status; select * from t1 where a in (select a from t2 where b=3); a show status like "handler_read%"; Variable_name Value Handler_read_first 0 Handler_read_key 2 Handler_read_last 0 Handler_read_next 0 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 3 drop table t1,t2; # # Bug#13735980 Difference in number of rows when using subqueries # CREATE TABLE m (c1 VARCHAR(1), c2 INTEGER, c3 INTEGER); INSERT INTO m VALUES ('',6,8), ('',75,NULL); CREATE TABLE o (c1 VARCHAR(1)); INSERT INTO o VALUES ('S'), ('S'), ('S'); CREATE VIEW v1 AS SELECT m.c1 AS c1,m.c2 AS c2,m.c3 AS c3 FROM m; CREATE VIEW v2 AS SELECT o.c1 AS c1 FROM o; SELECT t1.c3 FROM v1 AS t1 JOIN v2 AS t2 ON t1.c1 < t2.c1 WHERE t1.c3 BETWEEN 2 AND 6 OR (t1.c3 IN(4) AND t1.c3 <> 2) OR t1.c2 >= 8; c3 NULL NULL NULL CREATE TABLE integers (i1 INTEGER); INSERT IGNORE INTO integers VALUES (2),(4),(6),(8); SELECT t1.c3 FROM v1 AS t1 JOIN v2 AS t2 ON t1.c1 < t2.c1 WHERE t1.c3 BETWEEN (SELECT i1 FROM integers WHERE i1 = 2) AND (SELECT i1 FROM integers WHERE i1 = 6) OR t1.c3 IN((SELECT i1 FROM integers WHERE i1 = 4)) AND t1.c3 <>(SELECT i1 FROM integers WHERE i1 = 2) OR t1.c2 >=(SELECT i1 FROM integers WHERE i1 = 8); c3 NULL NULL NULL SELECT t1.c3 FROM m AS t1 JOIN o AS t2 ON t1.c1 < t2.c1 WHERE t1.c3 BETWEEN (SELECT i1 FROM integers WHERE i1 = 2) AND (SELECT i1 FROM integers WHERE i1 = 6) OR t1.c3 IN((SELECT i1 FROM integers WHERE i1 = 4)) AND t1.c3 <>(SELECT i1 FROM integers WHERE i1 = 2) OR t1.c2 >=(SELECT i1 FROM integers WHERE i1 = 8); c3 NULL NULL NULL DROP VIEW v1, v2; DROP TABLE m, o, integers; # # Bug#13721076 CRASH WITH TIME TYPE/TIMESTAMP() AND WARNINGS IN SUBQUERY # CREATE TABLE t1(a TIME NOT NULL); INSERT INTO t1 VALUES ('00:00:32'); SELECT 1 FROM t1 WHERE a > (SELECT timestamp(a) AS a FROM t1); 1 DROP TABLE t1; # # Bug #13736664 RIGHT JOIN+WHERE QUERY GIVES DIFF RESULTS WHEN USING # SELECT * SUBQ FOR TABLES # CREATE TABLE t1(a INT, b CHAR(1)); INSERT INTO t1 VALUES (NULL, 'x'); CREATE TABLE t2(c INT, d CHAR(1)); INSERT INTO t2 VALUES (NULL, 'y'), (9, 'z'); SELECT d FROM t2 AS a2 RIGHT JOIN t1 AS a1 ON c = a WHERE d LIKE '_' ORDER BY d; d SELECT d FROM (SELECT * FROM t2) AS a2 RIGHT JOIN (SELECT * FROM t1) AS a1 ON c = a WHERE d LIKE '_' ORDER BY d; d DROP TABLE t1, t2; # # Bug#13468414 Query shows different results when literals are selected # from separate table # CREATE TABLE t1 ( col_varchar_key varchar(1) NOT NULL, col_varchar_nokey varchar(1) NOT NULL, KEY col_varchar_key (col_varchar_key) ) ENGINE=InnoDB; INSERT INTO t1 VALUES ('v','v'), ('s','s'), ('l','l'), ('y','y'), ('c','c'), ('i','i'), ('h','h'), ('q','q'), ('a','a'), ('v','v'), ('u','u'), ('s','s'), ('y','y'), ('z','z'), ('h','h'), ('p','p'), ('e','e'), ('i','i'), ('y','y'), ('w','w'); CREATE TABLE t2 ( col_int_nokey INT NOT NULL, col_varchar_nokey varchar(1) NOT NULL ) ENGINE=InnoDB; INSERT INTO t2 VALUES (4,'j'), (6,'v'), (3,'c'), (5,'m'), (3,'d'), (246,'d'), (2,'y'), (9,'t'), (3,'d'), (8,'s'), (1,'r'), (8,'m'), (8,'b'), (5,'x'), (7,'g'), (5,'p'), (1,'q'), (6,'w'), (2,'d'), (9,'e'); CREATE TABLE t0 ( i1 INTEGER NOT NULL PRIMARY KEY ); INSERT INTO t0 VALUES (7); SELECT col_varchar_nokey FROM t1 WHERE (7) NOT IN (SELECT it2.col_int_nokey FROM t2 AS it2 LEFT JOIN t1 AS it1 ON it2.col_varchar_nokey = it1.col_varchar_key ); col_varchar_nokey SELECT col_varchar_nokey FROM t1 WHERE (SELECT i1 FROM t0 WHERE i1 = 7) NOT IN (SELECT it2.col_int_nokey FROM t2 AS it2 LEFT JOIN t1 AS it1 ON it2.col_varchar_nokey = it1.col_varchar_key ); col_varchar_nokey explain extended SELECT col_varchar_nokey FROM t1 WHERE (SELECT i1 FROM t0 WHERE i1 = 7) NOT IN (SELECT it2.col_int_nokey FROM t2 AS it2 LEFT JOIN t1 AS it1 ON it2.col_varchar_nokey = it1.col_varchar_key ); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 3 DEPENDENT SUBQUERY it2 ALL NULL NULL NULL NULL 20 100.00 Using where 3 DEPENDENT SUBQUERY it1 ref col_varchar_key col_varchar_key 3 test.it2.col_varchar_nokey 1 100.00 Using index 2 SUBQUERY t0 system PRIMARY NULL NULL NULL 1 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`col_varchar_nokey` AS `col_varchar_nokey` from `test`.`t1` where (not(<in_optimizer>((/* select#2 */ select '7' from dual where 1),<exists>(/* select#3 */ select 1 from `test`.`t2` `it2` left join `test`.`t1` `it1` on((`test`.`it1`.`col_varchar_key` = `test`.`it2`.`col_varchar_nokey`)) where <if>(outer_field_is_not_null, (<cache>((/* select#2 */ select '7' from dual where 1)) = `test`.`it2`.`col_int_nokey`), true))))) DROP TABLE t0, t1, t2; # # Bug#13735704 Memory engine + NOT IN + subquery produces different # result set # CREATE TABLE t1( col_varchar_key varchar(1), KEY col_varchar_key(col_varchar_key) ) engine=MEMORY; INSERT INTO t1 VALUES ('v'), ('s'), ('y'), ('z'), ('h'), ('p'); CREATE TABLE t2( col_int_nokey int, col_int_key int, KEY col_int_key(col_int_key) ) engine=MEMORY; INSERT INTO t2 VALUES (4,4), (2,7), (2,5), (2,3), (197,188), (4,4), (6,2), (1,4), (156,231), (2,1), (1,2), (80,194), (3,2), (8,3), (91,98), (6,3), (7,1), (3,0), (161,189), (7,8), (7,3), (213,120), (248,25), (1,1), (6,3), (6,1), (3,3), (140,153), (0,5), (7,9), (6,1), (1,2), (1,7), (9,2), (0,1), (6,5); CREATE TABLE t0(i1 INTEGER NOT NULL PRIMARY KEY); INSERT INTO t0 VALUES(7),(2); SELECT col_varchar_key FROM t1 WHERE (7,2) NOT IN (SELECT col_int_key,col_int_nokey FROM t2); col_varchar_key explain extended SELECT col_varchar_key FROM t1 WHERE ((SELECT i1 FROM t0 WHERE i1 = 7), (SELECT i1 FROM t0 WHERE i1 = 2)) NOT IN (SELECT col_int_key,col_int_nokey FROM t2); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 4 DEPENDENT SUBQUERY t2 index_subquery col_int_key col_int_key 5 func 4 100.00 Using where; Full scan on NULL key 3 SUBQUERY t0 const PRIMARY PRIMARY 4 const 1 100.00 Using index 2 SUBQUERY t0 const PRIMARY PRIMARY 4 const 1 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`col_varchar_key` AS `col_varchar_key` from `test`.`t1` where (not(<in_optimizer>(((/* select#2 */ select '7' from `test`.`t0` where 1),(/* select#3 */ select '2' from `test`.`t0` where 1)),<exists>(<index_lookup>(<cache>((/* select#2 */ select '7' from `test`.`t0` where 1)) in t2 on col_int_key checking NULL where (<if>(outer_field_is_not_null, ((<cache>((/* select#2 */ select '7' from `test`.`t0` where 1)) = `test`.`t2`.`col_int_key`) or isnull(`test`.`t2`.`col_int_key`)), true) and <if>(outer_field_is_not_null, ((<cache>((/* select#3 */ select '2' from `test`.`t0` where 1)) = `test`.`t2`.`col_int_nokey`) or isnull(`test`.`t2`.`col_int_nokey`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`col_int_key`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`col_int_nokey`), true))))))) SELECT col_varchar_key FROM t1 WHERE ((SELECT i1 FROM t0 WHERE i1 = 7), (SELECT i1 FROM t0 WHERE i1 = 2)) NOT IN (SELECT col_int_key,col_int_nokey FROM t2); col_varchar_key DROP TABLE t0, t1, t2; # # Bug #13639204 64111: CRASH ON SELECT SUBQUERY WITH NON UNIQUE # INDEX # CREATE TABLE t1 ( id int ) ENGINE=InnoDB; INSERT INTO t1 (id) VALUES (11); CREATE TABLE t2 ( t1_id int, position int, KEY t1_id (t1_id), KEY t1_id_position (t1_id,position) ) ENGINE=InnoDB; EXPLAIN SELECT (SELECT position FROM t2 WHERE t2.t1_id = t1.id ORDER BY t2.t1_id , t2.position LIMIT 10,1 ) AS maxkey FROM t1 LIMIT 1; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 1 NULL 2 DEPENDENT SUBQUERY t2 ref t1_id,t1_id_position t1_id_position 5 test.t1.id 1 Using where SELECT (SELECT position FROM t2 WHERE t2.t1_id = t1.id ORDER BY t2.t1_id , t2.position LIMIT 10,1 ) AS maxkey FROM t1 LIMIT 1; maxkey NULL DROP TABLE t1,t2; # # Bug#13731417 WRONG RESULT WITH NOT IN (SUBQUERY) AND # COMPOSITE INDEX ON SUBQUERY'S TABLE # CREATE TABLE t1 (a int, b int); CREATE TABLE t2 (a int, b int, KEY a_b (a,b)); CREATE TABLE t4 (a int); INSERT INTO t1 VALUES(0,1); INSERT INTO t2 VALUES(NULL,1),(NULL,1); INSERT INTO t4 VALUES(1); SELECT ((0,1) NOT IN (SELECT NULL,1)) IS NULL; ((0,1) NOT IN (SELECT NULL,1)) IS NULL 1 EXPLAIN EXTENDED SELECT * FROM t1 WHERE ((a,b) NOT IN (SELECT t2.a,t2.b FROM t4 STRAIGHT_JOIN t2 WHERE t4.a=t2.b)) IS NULL; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00 NULL 2 DEPENDENT SUBQUERY t4 system NULL NULL NULL NULL 1 100.00 NULL 2 DEPENDENT SUBQUERY t2 ref_or_null a_b a_b 10 func,const 2 100.00 Using where; Using index; Full scan on NULL key Warnings: Note 1003 /* select#1 */ select '0' AS `a`,'1' AS `b` from dual where isnull((not(<in_optimizer>(('0','1'),<exists>(/* select#2 */ select 1,1 from `test`.`t2` where ((`test`.`t2`.`b` = '1') and <if>(outer_field_is_not_null, ((<cache>('0') = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`)), true) and <if>(outer_field_is_not_null, ((<cache>('1') = '1') or <cache>(isnull('1'))), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`a`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`b`), true))))))) SELECT * FROM t1 WHERE ((a,b) NOT IN (SELECT t2.a,t2.b FROM t4 STRAIGHT_JOIN t2 WHERE t4.a=t2.b)) IS NULL; a b 0 1 ALTER TABLE t2 DROP INDEX a_b; EXPLAIN EXTENDED SELECT * FROM t1 WHERE ((a,b) NOT IN (SELECT t2.a,t2.b FROM t4 STRAIGHT_JOIN t2 WHERE t4.a=t2.b)) IS NULL; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00 NULL 2 DEPENDENT SUBQUERY t4 system NULL NULL NULL NULL 1 100.00 NULL 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1003 /* select#1 */ select '0' AS `a`,'1' AS `b` from dual where isnull((not(<in_optimizer>(('0','1'),<exists>(/* select#2 */ select 1,1 from `test`.`t2` where ((`test`.`t2`.`b` = '1') and <if>(outer_field_is_not_null, ((<cache>('0') = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`)), true) and <if>(outer_field_is_not_null, ((<cache>('1') = '1') or <cache>(isnull('1'))), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`a`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`b`), true))))))) SELECT * FROM t1 WHERE ((a,b) NOT IN (SELECT t2.a,t2.b FROM t4 STRAIGHT_JOIN t2 WHERE t4.a=t2.b)) IS NULL; a b 0 1 DROP TABLE t1,t2,t4; # # Bug#13725821 ASSERT NULL_REF_KEY == __NULL FAILED IN # CREATE_REF_FOR_KEY() IN SQL_SELECT.CC # CREATE TABLE t1 ( pk INT NOT NULL, col_int_nokey INT, col_int_key INT, col_varchar_key VARCHAR(1), col_varchar_nokey VARCHAR(1), PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ) ENGINE=MyISAM; INSERT INTO t1 VALUES (17,NULL,9,NULL,NULL), (18,2,2,'o','o'),(19,NULL,9,'w','w'),(20,6,2,'m','m'),(21,7,4,'q','q'), (22,2,0,NULL,NULL),(23,5,4,'d','d'),(24,7,8,'g','g'),(25,6,NULL,'x','x'), (26,6,NULL,'f','f'),(27,2,0,'p','p'),(28,9,NULL,'j','j'),(29,6,8,'c','c'); ALTER TABLE t1 DISABLE KEYS; ALTER TABLE t1 ENABLE KEYS; CREATE TABLE t2 SELECT table1.col_varchar_key AS field1, table1.col_int_nokey AS field2, table2.col_varchar_key AS field3, table1.col_int_nokey AS field4, table2.col_int_nokey AS field5, table1.col_varchar_nokey AS field6 FROM ( t1 AS table1 INNER JOIN t1 AS table2 ON (( table2.col_int_nokey = table1.col_int_key ) AND ( table2.col_int_key = table1.col_int_key ) ) ) WHERE ( table1.col_varchar_key = table2.col_varchar_key OR table1.pk = 154 ) OR table1.pk != 201 AND ( table1.col_varchar_key LIKE '%a%' OR table1.col_varchar_key LIKE '%b%') ; SELECT * FROM t2 WHERE (field1, field2, field3, field4, field5, field6) NOT IN ( SELECT table1.col_varchar_key AS field1, table1.col_int_nokey AS field2, table2.col_varchar_key AS field3, table1.col_int_nokey AS field4, table2.col_int_nokey AS field5, table1.col_varchar_nokey AS field6 FROM ( t1 AS table1 INNER JOIN t1 AS table2 ON (( table2.col_int_nokey = table1.col_int_key ) AND ( table2.col_int_key = table1.col_int_key ) ) ) WHERE ( table1.col_varchar_key = table2.col_varchar_key OR table1.pk = 154 ) OR table1.pk != 201 AND ( table1.col_varchar_key LIKE '%a%' OR table1.col_varchar_key LIKE '%b%') ); field1 field2 field3 field4 field5 field6 DROP TABLE t2,t1; # # Bug #13735712 SELECT W/ SUBQUERY PRODUCES MORE ROWS WHEN USING # VARIABLES # CREATE TABLE t1(a INT); INSERT INTO t1 VALUES(9); CREATE TABLE t2(b INT); INSERT INTO t2 VALUES(8); CREATE TABLE t3(c INT); INSERT INTO t3 VALUES(3); SELECT * FROM t2 RIGHT JOIN t3 ON(c = b) WHERE b < ALL(SELECT a FROM t1 WHERE a <= 7); b c NULL 3 SET @var = 7; SELECT * FROM t2 RIGHT JOIN t3 ON(c = b) WHERE b < ALL(SELECT a FROM t1 WHERE a <= @var); b c NULL 3 DROP TABLE t1, t2, t3; # # Bug #13330886 TOO MANY ROWS WITH ALL|ANY # CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (NULL,8), (8,7); CREATE TABLE t2 (c INT); INSERT INTO t2 VALUES (10); SELECT 1 FROM t2 WHERE c > ALL (SELECT a FROM t1 WHERE b >= 3); 1 SET @var = 3; SELECT 1 FROM t2 WHERE c > ALL (SELECT a FROM t1 WHERE b >= @var); 1 DROP TABLE t1, t2; CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL); INSERT INTO t1 VALUES (0,8), (8,7); CREATE TABLE t2 (c INT NOT NULL); INSERT INTO t2 VALUES (10); EXPLAIN EXTENDED SELECT 1 FROM t2 WHERE c > ANY (SELECT a FROM t1 WHERE b >= 3) IS TRUE; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 system NULL NULL NULL NULL 1 100.00 NULL 2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1003 /* select#1 */ select 1 AS `1` from dual where (<nop>(('10' > (/* select#2 */ select min(`test`.`t1`.`a`) from `test`.`t1` where (`test`.`t1`.`b` >= 3)))) is true) SELECT 1 FROM t2 WHERE c > ANY (SELECT a FROM t1 WHERE b >= 3) IS TRUE; 1 1 DROP TABLE t1, t2; # Bug #18014565 - WRONG RESULT COMPUTATION USING ALL() AND GROUP BY # CREATE TABLE t1 ( f1 INTEGER, f2 INTEGER ); INSERT INTO t1 VALUES (1,3),(1,6),(2,3),(2,6); SELECT f1, SUM(f2) AS sum FROM t1 GROUP BY f1 HAVING sum > ALL (SELECT 1); f1 sum 1 9 2 9 DROP TABLE t1; # End of test for Bug#18014565 set @@optimizer_switch=@old_opt_switch; set optimizer_switch=default;