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drop table if exists t1,t2,t3; select * from (select 2 from DUAL) b; 2 2 SELECT 1 as a FROM (SELECT 1 UNION SELECT a) b; ERROR 42S22: Unknown column 'a' in 'field list' SELECT 1 as a FROM (SELECT a UNION SELECT 1) b; ERROR 42S22: Unknown column 'a' in 'field list' CREATE TABLE t1 (a int not null, b char (10) not null); insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c'); CREATE TABLE t2 (a int not null, b char (10) not null); insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e'); select t1.a,t3.y from t1,(select a as y from t2 where b='c') as t3 where t1.a = t3.y; a y 3 3 3 3 select t1.a,t3.a from t1,(select * from t2 where b='c') as t3 where t1.a = t3.a; a a 3 3 3 3 CREATE TABLE t3 (a int not null, b char (10) not null); insert into t3 values (3,'f'),(4,'y'),(5,'z'),(6,'c'); select t1.a,t4.y from t1,(select t2.a as y from t2,(select t3.b from t3 where t3.a>3) as t5 where t2.b=t5.b) as t4 where t1.a = t4.y; a y 3 3 3 3 SELECT a FROM (SELECT 1 FROM (SELECT 1) a HAVING a=1) b; ERROR 42S22: Unknown column 'a' in 'having clause' SELECT a,b as a FROM (SELECT '1' as a,'2' as b) b HAVING a=1; ERROR 23000: Column 'a' in having clause is ambiguous SELECT a,2 as a FROM (SELECT '1' as a) b HAVING a=2; a a 1 2 SELECT a,2 as a FROM (SELECT '1' as a) b HAVING a=1; a a SELECT 1 FROM (SELECT 1) a WHERE a=2; ERROR 42S22: Unknown column 'a' in 'where clause' SELECT (SELECT 1) as a FROM (SELECT 1 FROM t1 HAVING a=1) as a; ERROR 42S22: Unknown column 'a' in 'having clause' select * from t1 as x1, (select * from t1) as x2; a b a b 1 a 1 a 2 b 1 a 3 c 1 a 3 c 1 a 1 a 2 b 2 b 2 b 3 c 2 b 3 c 2 b 1 a 3 c 2 b 3 c 3 c 3 c 3 c 3 c 1 a 3 c 2 b 3 c 3 c 3 c 3 c 3 c explain select * from t1 as x1, (select * from t1) as x2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY x1 ALL NULL NULL NULL NULL 4 NULL 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 Using join buffer (Block Nested Loop) 2 DERIVED t1 ALL NULL NULL NULL NULL 4 NULL drop table if exists t2,t3; select * from (select 1) as a; 1 1 select a from (select 1 as a) as b; a 1 select 1 from (select 1) as a; 1 1 select * from (select * from t1 union select * from t1) a; a b 1 a 2 b 3 c select * from (select * from t1 union all select * from t1) a; a b 1 a 2 b 3 c 3 c 1 a 2 b 3 c 3 c select * from (select * from t1 union all select * from t1 limit 2) a; a b 1 a 2 b explain select * from (select * from t1 union select * from t1) a; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 8 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 4 NULL 3 UNION t1 ALL NULL NULL NULL NULL 4 NULL NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL Using temporary explain select * from (select * from t1 union all select * from t1) a; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 8 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 4 NULL 3 UNION t1 ALL NULL NULL NULL NULL 4 NULL NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL Using temporary CREATE TABLE t2 (a int not null); insert into t2 values(1); select * from (select * from t1 where t1.a=(select a from t2 where t2.a=t1.a)) a; a b 1 a select * from (select * from t1 where t1.a=(select t2.a from t2 where t2.a=t1.a) union select t1.a, t1.b from t1) a; a b 1 a 2 b 3 c explain select * from (select t1.*, t2.a as t2a from t1,t2 where t1.a=t2.a) t1; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 NULL 2 DERIVED t2 system NULL NULL NULL NULL 1 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where drop table t1, t2; create table t1(a int not null, t char(8), index(a)); SELECT * FROM (SELECT * FROM t1) as b ORDER BY a ASC LIMIT 0,20; a t 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 explain select count(*) from t1 as tt1, (select * from t1) as tt2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY tt1 index NULL a 4 NULL 10000 Using index 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 10000 Using join buffer (Block Nested Loop) 2 DERIVED t1 ALL NULL NULL NULL NULL 10000 NULL drop table t1; SELECT * FROM (SELECT (SELECT * FROM (SELECT 1 as a) as a )) as b; (SELECT * FROM (SELECT 1 as a) as a ) 1 select * from (select 1 as a) b left join (select 2 as a) c using(a); a 1 SELECT * FROM (SELECT 1 UNION SELECT a) b; ERROR 42S22: Unknown column 'a' in 'field list' SELECT 1 as a FROM (SELECT a UNION SELECT 1) b; ERROR 42S22: Unknown column 'a' in 'field list' SELECT 1 as a FROM (SELECT 1 UNION SELECT a) b; ERROR 42S22: Unknown column 'a' in 'field list' select 1 from (select 2) a order by 0; ERROR 42S22: Unknown column '0' in 'order clause' create table t1 (id int); insert into t1 values (1),(2),(3); describe select * from (select * from t1 group by id) bar; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort drop table t1; create table t1 (mat_id MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, matintnum CHAR(6) NOT NULL, test MEDIUMINT UNSIGNED NULL); create table t2 (mat_id MEDIUMINT UNSIGNED NOT NULL, pla_id MEDIUMINT UNSIGNED NOT NULL); insert into t1 values (NULL, 'a', 1), (NULL, 'b', 2), (NULL, 'c', 3), (NULL, 'd', 4), (NULL, 'e', 5), (NULL, 'f', 6), (NULL, 'g', 7), (NULL, 'h', 8), (NULL, 'i', 9); insert into t2 values (1, 100), (1, 101), (1, 102), (2, 100), (2, 103), (2, 104), (3, 101), (3, 102), (3, 105); analyze table t1, t2; Table Op Msg_type Msg_text test.t1 analyze status OK test.t2 analyze status OK SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum; pla_id mat_id 100 1 101 1 102 1 103 2 104 2 105 3 SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum; pla_id test 100 1 101 1 102 1 103 2 104 2 105 3 explain SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY m2 ALL NULL NULL NULL NULL 9 NULL 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 7 test.m2.matintnum 2 NULL 2 DERIVED mp ALL NULL NULL NULL NULL 9 Using temporary; Using filesort 2 DERIVED m1 eq_ref PRIMARY PRIMARY 3 test.mp.mat_id 1 NULL explain SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY m2 ALL NULL NULL NULL NULL 9 NULL 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 7 test.m2.matintnum 2 NULL 2 DERIVED mp ALL NULL NULL NULL NULL 9 Using temporary; Using filesort 2 DERIVED m1 eq_ref PRIMARY PRIMARY 3 test.mp.mat_id 1 NULL drop table t1,t2; SELECT a.x FROM (SELECT 1 AS x) AS a HAVING a.x = 1; x 1 create user mysqltest_1; create table t1 select 1 as a; select 2 as a from (select * from t1) b; ERROR 3D000: No database selected use test; select 2 as a from (select * from t1) b; a 2 drop table t1; select mail_id, if(folder.f_description!='', folder.f_description, folder.f_name) as folder_name, date, address_id, phrase, address, subject from folder, (select mail.mail_id as mail_id, date_format(mail.h_date, '%b %e, %Y %h:%i') as date, mail.folder_id, sender.address_id as address_id, sender.phrase as phrase, sender.address as address, mail.h_subject as subject from mail left join mxa as mxa_sender on mail.mail_id=mxa_sender.mail_id and mxa_sender.type='from' left join address as sender on mxa_sender.address_id=sender.address_id mxa as mxa_recipient, address as recipient, where 1 and mail.mail_id=mxa_recipient.mail_id and mxa_recipient.address_id=recipient.address_id and mxa_recipient.type='to' and match(sender.phrase, sender.address, sender.comment) against ('jeremy' in boolean mode) and match(recipient.phrase, recipient.address, recipient.comment) against ('monty' in boolean mode) order by mail.h_date desc limit 0, 25 ) as query where query.folder_id=folder.folder_id; 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 'mxa as mxa_recipient, address as recipient, where 1 and mail.mail_id=mxa_r' at line 1 create table t1 (a int); insert into t1 values (1),(2),(3); update (select * from t1) as t1 set a = 5; ERROR HY000: The target table t1 of the UPDATE is not updatable delete from (select * 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 '(select * from t1)' at line 1 insert into (select * from t1) values (5); 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 * from t1) values (5)' at line 1 drop table t1; create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1) ); insert into t1 VALUES(1,1,1), (2,2,1); select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2; count(*) 2 explain select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 2 Using where 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 4 test.t1.E1 2 NULL 2 DERIVED A ALL NULL NULL NULL NULL 2 Using where 3 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 2 Using where drop table t1; create table t1 (a int); insert into t1 values (1),(2); select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b; a a 1 1 2 1 1 2 2 2 explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 NULL 1 PRIMARY <derived4> ALL NULL NULL NULL NULL 4 Using join buffer (Block Nested Loop) 4 DERIVED t1 ALL NULL NULL NULL NULL 2 NULL 5 UNION t1 ALL NULL NULL NULL NULL 2 NULL NULL UNION RESULT <union4,5> ALL NULL NULL NULL NULL NULL Using temporary 2 DERIVED t1 ALL NULL NULL NULL NULL 2 NULL 3 UNION t1 ALL NULL NULL NULL NULL 2 NULL NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL Using temporary drop table t1; CREATE TABLE `t1` ( `N` int(11) unsigned NOT NULL default '0', `M` tinyint(1) default '0' ) ENGINE=MyISAM DEFAULT CHARSET=latin1; INSERT INTO `t1` (N, M) VALUES (1, 0),(1, 0),(1, 0),(2, 0),(2, 0),(3, 0); UPDATE `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2; select * from t1; N M 1 2 1 2 1 2 2 2 2 2 3 0 UPDATE `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2, P2.N = 2; ERROR HY000: The target table P2 of the UPDATE is not updatable UPDATE `t1` AS P1 INNER JOIN (SELECT aaaa FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2; ERROR 42S22: Unknown column 'aaaa' in 'field list' delete P1.* from `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N; select * from t1; N M 3 0 delete P1.*,p2.* from `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS p2 ON P1.N = p2.N; ERROR HY000: The target table p2 of the DELETE is not updatable delete P1.* from `t1` AS P1 INNER JOIN (SELECT aaa FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N; ERROR 42S22: Unknown column 'aaa' in 'field list' drop table t1; CREATE TABLE t1 ( OBJECTID int(11) NOT NULL default '0', SORTORDER int(11) NOT NULL auto_increment, KEY t1_SortIndex (SORTORDER), KEY t1_IdIndex (OBJECTID) ) ENGINE=MyISAM DEFAULT CHARSET=latin1; CREATE TABLE t2 ( ID int(11) default NULL, PARID int(11) default NULL, UNIQUE KEY t2_ID_IDX (ID), KEY t2_PARID_IDX (PARID) ) engine=MyISAM DEFAULT CHARSET=latin1; INSERT INTO t2 VALUES (1000,0),(1001,0),(1002,0),(1003,0),(1008,1),(1009,1),(1010,1),(1011,1),(1016,2); CREATE TABLE t3 ( ID int(11) default NULL, DATA decimal(10,2) default NULL, UNIQUE KEY t3_ID_IDX (ID) ) engine=MyISAM DEFAULT CHARSET=latin1; INSERT INTO t3 VALUES (1000,0.00),(1001,0.25),(1002,0.50),(1003,0.75),(1008,1.00),(1009,1.25),(1010,1.50),(1011,1.75); select 497, TMP.ID, NULL from (select 497 as ID, MAX(t3.DATA) as DATA from t1 join t2 on (t1.ObjectID = t2.ID) join t3 on (t1.ObjectID = t3.ID) group by t2.ParID order by DATA DESC) as TMP; 497 ID NULL drop table t1, t2, t3; CREATE TABLE t1 (name char(1) default NULL, val int(5) default NULL); INSERT INTO t1 VALUES ('a',1), ('a',2), ('a',2), ('a',2), ('a',3), ('a',6), ('a',7), ('a',11), ('a',11), ('a',12), ('a',13), ('a',13), ('a',20), ('b',2), ('b',3), ('b',4), ('b',5); SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x, t1 y WHERE x.name=y.name GROUP BY x.name, x.val HAVING SUM(y.val <= x.val) >= COUNT(*)/2 AND SUM(y.val >= x.val) >= COUNT(*)/2) AS s GROUP BY s.name; name median a 7.0000 b 3.5000 explain SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x, t1 y WHERE x.name=y.name GROUP BY x.name, x.val HAVING SUM(y.val <= x.val) >= COUNT(*)/2 AND SUM(y.val >= x.val) >= COUNT(*)/2) AS s GROUP BY s.name; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 289 Using temporary; Using filesort 2 DERIVED x ALL NULL NULL NULL NULL 17 Using temporary; Using filesort 2 DERIVED y ALL NULL NULL NULL NULL 17 Using where; Using join buffer (Block Nested Loop) drop table t1; create table t2 (a int, b int, primary key (a)); insert into t2 values (1,7),(2,7); explain select a from t2 where a>1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index PRIMARY PRIMARY 4 NULL 2 Using where; Using index explain select a from (select a from t2 where a>1) tt; 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 t2 index PRIMARY PRIMARY 4 NULL 2 Using where; Using index drop table t2; CREATE TABLE `t1` ( `itemid` int(11) NOT NULL default '0', `grpid` varchar(15) NOT NULL default '', `vendor` int(11) NOT NULL default '0', `date_` date NOT NULL default '0000-00-00', `price` decimal(12,2) NOT NULL default '0.00', PRIMARY KEY (`itemid`,`grpid`,`vendor`,`date_`), KEY `itemid` (`itemid`,`vendor`), KEY `itemid_2` (`itemid`,`date_`)); insert into t1 values (128, 'rozn', 2, curdate(), 10), (128, 'rozn', 1, curdate(), 10); SELECT MIN(price) min, MAX(price) max, AVG(price) avg FROM (SELECT SUBSTRING( MAX(concat(date_,";",price)), 12) price FROM t1 WHERE itemid=128 AND grpid='rozn' GROUP BY itemid, grpid, vendor) lastprices; min max avg 10.00 10.00 10 DROP TABLE t1; create table t1 (a integer, b integer); insert into t1 values (1,4), (2,2),(2,2), (4,1),(4,1),(4,1),(4,1); select distinct sum(b) from t1 group by a; sum(b) 4 select distinct sum(b) from (select a,b from t1) y group by a; sum(b) 4 drop table t1; CREATE TABLE t1 (a char(10), b char(10)); INSERT INTO t1 VALUES ('root','localhost'), ('root','%'); SELECT * FROM (SELECT (SELECT a.a FROM t1 AS a WHERE a.a = b.a) FROM t1 AS b) AS c; ERROR 21000: Subquery returns more than 1 row DROP TABLE t1; create table t1(a int); create table t2(a int); create table t3(a int); insert into t1 values(1),(1); insert into t2 values(2),(2); insert into t3 values(3),(3); select * from t1 union distinct select * from t2 union all select * from t3; a 1 2 3 3 select * from (select * from t1 union distinct select * from t2 union all select * from t3) X; a 1 2 3 3 drop table t1, t2, t3; create table t1 (a int); create table t2 (a int); select * from (select * from t1,t2) foo; ERROR 42S21: Duplicate column name 'a' drop table t1,t2; create table t1 (ID int unsigned not null auto_increment, DATA varchar(5) not null, primary key (ID)); create table t2 (ID int unsigned not null auto_increment, DATA varchar(5) not null, FID int unsigned not null, primary key (ID)); select A.* from (t1 inner join (select * from t2) as A on t1.ID = A.FID); ID DATA FID select t2.* from ((select * from t1) as A inner join t2 on A.ID = t2.FID); ID DATA FID select t2.* from (select * from t1) as A inner join t2 on A.ID = t2.FID; ID DATA FID drop table t1, t2; drop user mysqltest_1; # End of 4.1 tests SELECT 0 FROM (SELECT 0) t01, (SELECT 0) t02, (SELECT 0) t03, (SELECT 0) t04, (SELECT 0) t05, (SELECT 0) t06, (SELECT 0) t07, (SELECT 0) t08, (SELECT 0) t09, (SELECT 0) t10, (SELECT 0) t11, (SELECT 0) t12, (SELECT 0) t13, (SELECT 0) t14, (SELECT 0) t15, (SELECT 0) t16, (SELECT 0) t17, (SELECT 0) t18, (SELECT 0) t19, (SELECT 0) t20, (SELECT 0) t21, (SELECT 0) t22, (SELECT 0) t23, (SELECT 0) t24, (SELECT 0) t25, (SELECT 0) t26, (SELECT 0) t27, (SELECT 0) t28, (SELECT 0) t29, (SELECT 0) t30, (SELECT 0) t31, (SELECT 0) t32, (SELECT 0) t33, (SELECT 0) t34, (SELECT 0) t35, (SELECT 0) t36, (SELECT 0) t37, (SELECT 0) t38, (SELECT 0) t39, (SELECT 0) t40, (SELECT 0) t41, (SELECT 0) t42, (SELECT 0) t43, (SELECT 0) t44, (SELECT 0) t45, (SELECT 0) t46, (SELECT 0) t47, (SELECT 0) t48, (SELECT 0) t49, (SELECT 0) t50, (SELECT 0) t51, (SELECT 0) t52, (SELECT 0) t53, (SELECT 0) t54, (SELECT 0) t55, (SELECT 0) t56, (SELECT 0) t57, (SELECT 0) t58, (SELECT 0) t59, (SELECT 0) t60, (SELECT 0) t61; 0 0 # # A nested materialized derived table is used before being populated. # (addon for bug#19077) # 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 = SUBSTRING('12', (SELECT * FROM (SELECT MIN(j) FROM t1) t2))) t3; MIN(i) 1 DROP TABLE t1; # End of 5.0 tests # # Bug#55586: Crash JOIN of two subqueries in FROM + ORDER BY and GROUP BY # CREATE TABLE C ( `col_int_key` int(11) DEFAULT NULL, `col_varchar_key` varchar(1) DEFAULT NULL, `col_varchar_nokey` varchar(1) DEFAULT NULL, KEY `col_varchar_key` (`col_varchar_key`,`col_int_key`) ); INSERT INTO C VALUES (2,'w','w'); INSERT INTO C VALUES (2,'d','d'); SELECT SUM(DISTINCT table2.col_int_key) field1, table1.col_varchar_key field2 FROM (SELECT * FROM C ) table1 JOIN (SELECT * FROM C ) table2 ON table2 .`col_varchar_key` = table1 .`col_varchar_nokey` GROUP BY field2 ORDER BY field1; field1 field2 2 d 2 w DROP TABLE C; # End of test for bug#55586 # # Bug#55561: Crash on JOIN with 2 FROM subqueries # CREATE TABLE C ( col_int int DEFAULT NULL, col_varchar varchar(1) DEFAULT NULL ); INSERT INTO `C` VALUES (0,NULL); INSERT INTO `C` VALUES (5,'y'); SELECT table1.col_varchar FROM ( SELECT * FROM C ) table1 JOIN ( SELECT * FROM C ) table2 ON table2.col_varchar = table1.col_varchar WHERE table2.col_varchar < table2.col_varchar AND table1.col_varchar != 'k' LIMIT 1; col_varchar DROP TABLE C; # End on bug#55561 # # Bug#56233: Hang during key generation for derived tables # CREATE TABLE C ( col_varchar_10_key varchar(10) DEFAULT NULL, col_int_key int DEFAULT NULL, pk int NOT NULL AUTO_INCREMENT, col_date_key date DEFAULT NULL, PRIMARY KEY (`pk`), KEY `col_varchar_10_key` (`col_varchar_10_key`), KEY `col_int_key` (`col_int_key`), KEY `col_date_key` (`col_date_key`) ); INSERT INTO C VALUES ('ok',3,1,'2003-04-02'); CREATE ALGORITHM=TEMPTABLE VIEW viewC AS SELECT * FROM C; SELECT table1.col_date_key AS field1 FROM C AS table1 WHERE (table1.col_int_key <=ANY ( SELECT SUBQUERY1_t1.col_int_key FROM viewC AS SUBQUERY1_t1 WHERE SUBQUERY1_t1.col_varchar_10_key <= table1.col_varchar_10_key ) ) ; field1 2003-04-02 DROP TABLE C; DROP VIEW viewC; # # # Bug#55950: FROM Subquery joined by 2 varchar fields returns empty # set # CREATE TABLE `CC` ( `i1` varchar(1) DEFAULT NULL, `i2` varchar(1) DEFAULT NULL ); INSERT INTO `CC` VALUES ('m','m'); INSERT INTO `CC` VALUES ('c','c'); CREATE TABLE `C` ( `o1` varchar(1) DEFAULT NULL ); INSERT INTO `C` VALUES ('m'); SELECT table1 . o1 FROM C table1 JOIN ( C table2 JOIN ( SELECT * FROM CC ) table3 ON table3 .`i1` = table2 .o1 ) ON table3 .`i2` = table2 .o1 ; o1 m # Ref access to the derived table should be used. EXPLAIN SELECT table1 . o1 FROM C table1 JOIN ( C table2 JOIN ( SELECT * FROM CC ) table3 ON table3 .`i1` = table2 .o1 ) ON table3 .`i2` = table2 .o1 ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY table1 system NULL NULL NULL NULL 1 NULL 1 PRIMARY table2 system NULL NULL NULL NULL 1 NULL 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 8 const,const 0 Using index 2 DERIVED CC ALL NULL NULL NULL NULL 2 NULL DROP TABLE CC; DROP TABLE C; # End of test for bug#55950 # # Bug#56592: Subquery with DISTINCT in FROM clause returns only partial # result # CREATE TABLE `t1` ( `pk` int(11) NOT NULL, `col_int_key` int(11) DEFAULT NULL, `col_datetime_key` datetime DEFAULT NULL ) ENGINE=MyISAM; INSERT INTO t1 VALUES (2, 9, NULL), (3, 3, '1900-01-01 00:00:00'), (8, 8, '1900-01-01 00:00:00'), (15, 0, '2007-12-15 12:39:34'); SELECT * FROM ( SELECT DISTINCT tableB.col_datetime_key FROM t1 tableA LEFT JOIN t1 tableB ON tableA.pk < tableB.col_int_key ) AS FROM_SUBQUERY; col_datetime_key NULL 1900-01-01 00:00:00 EXPLAIN SELECT * FROM ( SELECT DISTINCT tableB.col_datetime_key FROM t1 tableA LEFT JOIN t1 tableB ON tableA.pk < tableB.col_int_key ) AS FROM_SUBQUERY; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 16 NULL 2 DERIVED tableA ALL NULL NULL NULL NULL 4 Using temporary 2 DERIVED tableB ALL NULL NULL NULL NULL 4 Using where; Distinct; Using join buffer (Block Nested Loop) EXPLAIN SELECT * FROM ( SELECT DISTINCT tableA.col_datetime_key FROM t1 tableA LEFT JOIN t1 tableB ON tableA.pk < tableB.col_int_key ) AS FROM_SUBQUERY; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 16 NULL 2 DERIVED tableA ALL NULL NULL NULL NULL 4 Using temporary 2 DERIVED tableB ALL NULL NULL NULL NULL 4 Using where; Distinct; Using join buffer (Block Nested Loop) DROP TABLE t1; # # Bug#58730 Assertion failed: table->key_read == 0 in close_thread_table, # temptable views # CREATE TABLE t1 (a INT); CREATE TABLE t2 (b INT, KEY (b)); INSERT INTO t1 VALUES (1),(1); INSERT INTO t2 VALUES (1),(1); CREATE algorithm=temptable VIEW v1 AS SELECT 1 FROM t1 LEFT JOIN t1 t3 ON 1 > (SELECT 1 FROM t1); CREATE algorithm=temptable VIEW v2 AS SELECT 1 FROM t2; EXPLAIN SELECT 1 FROM t1 JOIN v1 ON 1 > (SELECT 1 FROM v2); ERROR 21000: Subquery returns more than 1 row DROP TABLE t1, t2; DROP VIEW v1, v2; # # WL#5274: Postpone materialization of views/subqueries in FROM clause. # Additional tests. # CREATE TABLE t1(f1 int, f11 int); CREATE TABLE t2(f2 int, f22 int); INSERT INTO t1 VALUES(1,1),(2,2),(3,3),(5,5),(9,9),(7,7); INSERT INTO t2 VALUES(1,1),(3,3),(2,2),(4,4),(8,8),(6,6); for merged derived tables explain for simple derived EXPLAIN SELECT * FROM (SELECT * FROM t1) tt; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 6 NULL SELECT * FROM (SELECT * FROM t1) tt; f1 f11 1 1 2 2 3 3 5 5 9 9 7 7 explain for multitable derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM t1 JOIN t2 ON f1=f2) tt; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 36 100.00 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED t2 ALL NULL NULL NULL NULL 6 100.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11`,`tt`.`f2` AS `f2`,`tt`.`f22` AS `f22` from (/* select#2 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t1` join `test`.`t2` where (`test`.`t2`.`f2` = `test`.`t1`.`f1`)) `tt` SELECT * FROM (SELECT * FROM t1 JOIN t2 ON f1=f2) tt; f1 f11 f2 f22 1 1 1 1 3 3 3 3 2 2 2 2 explain for derived with where FLUSH STATUS; EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM t1 WHERE f1 IN (2,3)) tt WHERE f11=2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 const 0 100.00 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#2 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` in (2,3))) `tt` where (`tt`.`f11` = 2) 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 0 FLUSH STATUS; SELECT * FROM (SELECT * FROM t1 WHERE f1 IN (2,3)) tt WHERE f11=2; f1 f11 2 2 SHOW STATUS LIKE 'Handler_read%'; Variable_name Value Handler_read_first 0 Handler_read_key 1 Handler_read_last 0 Handler_read_next 1 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 7 join of derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM t1 WHERE f1 IN (2,3)) tt JOIN (SELECT * FROM t1 WHERE f1 IN (1,2)) aa ON tt.f1=aa.f1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived3> ref <auto_key0> <auto_key0> 5 tt.f1 2 100.00 NULL 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11`,`aa`.`f1` AS `f1`,`aa`.`f11` AS `f11` from (/* select#2 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` in (2,3))) `tt` join (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` in (1,2))) `aa` where (`aa`.`f1` = `tt`.`f1`) SELECT * FROM (SELECT * FROM t1 WHERE f1 IN (2,3)) tt JOIN (SELECT * FROM t1 WHERE f1 IN (1,2)) aa ON tt.f1=aa.f1; f1 f11 f1 f11 2 2 2 2 for merged views CREATE VIEW v1 AS SELECT * FROM t1; CREATE VIEW v2 AS SELECT * FROM t1 JOIN t2 ON f1=f2; CREATE VIEW v3 AS SELECT * FROM t1 WHERE f1 IN (2,3); CREATE VIEW v4 AS SELECT * FROM t2 WHERE f2 IN (2,3); explain for simple views EXPLAIN EXTENDED SELECT * FROM v1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 6 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` SELECT * FROM v1; f1 f11 1 1 2 2 3 3 5 5 9 9 7 7 explain for multitable views EXPLAIN EXTENDED SELECT * FROM v2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 6 100.00 NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 6 100.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t1` join `test`.`t2` where (`test`.`t2`.`f2` = `test`.`t1`.`f1`) SELECT * FROM v2; f1 f11 f2 f22 1 1 1 1 3 3 3 3 2 2 2 2 explain for views with where EXPLAIN EXTENDED SELECT * FROM v3 WHERE f11 IN (1,3); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f11` in (1,3)) and (`test`.`t1`.`f1` in (2,3))) SELECT * FROM v3 WHERE f11 IN (1,3); f1 f11 3 3 explain for joined views EXPLAIN EXTENDED SELECT * FROM v3 JOIN v4 ON f1=f2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 6 100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 6 100.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`f2` = `test`.`t1`.`f1`) and (`test`.`t1`.`f1` in (2,3)) and (`test`.`t1`.`f1` in (2,3))) SELECT * FROM v3 JOIN v4 ON f1=f2; f1 f11 f2 f22 3 3 3 3 2 2 2 2 FLUSH STATUS; EXPLAIN EXTENDED SELECT * FROM v4 WHERE f2 IN (1,3); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` where ((`test`.`t2`.`f2` in (1,3)) and (`test`.`t2`.`f2` in (2,3))) 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 0 FLUSH STATUS; SELECT * FROM v4 WHERE f2 IN (1,3); f2 f22 3 3 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 7 for materialized derived tables explain for simple derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM t1 GROUP BY f1) tt; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#2 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` group by `test`.`t1`.`f1`) `tt` SELECT * FROM (SELECT * FROM t1 HAVING f1=f1) tt; f1 f11 1 1 2 2 3 3 5 5 9 9 7 7 explain showing created indexes and late materialization FLUSH STATUS; EXPLAIN EXTENDED SELECT * FROM t1 JOIN (SELECT * FROM t2 GROUP BY f2) tt ON f1=f2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 test.t1.f1 2 100.00 NULL 2 DERIVED t2 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`tt`.`f2` AS `f2`,`tt`.`f22` AS `f22` from `test`.`t1` join (/* select#2 */ select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` group by `test`.`t2`.`f2`) `tt` where (`tt`.`f2` = `test`.`t1`.`f1`) 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 0 FLUSH STATUS; SELECT * FROM t1 JOIN (SELECT * FROM t2 GROUP BY f2) tt ON f1=f2; f1 f11 f2 f22 1 1 1 1 2 2 2 2 3 3 3 3 SHOW STATUS LIKE 'Handler_read%'; Variable_name Value Handler_read_first 0 Handler_read_key 6 Handler_read_last 0 Handler_read_next 3 Handler_read_prev 0 Handler_read_rnd 6 Handler_read_rnd_next 21 for materialized views DROP VIEW v1,v2,v3; CREATE VIEW v1 AS SELECT * FROM t1 GROUP BY f1; CREATE VIEW v2 AS SELECT * FROM t2 GROUP BY f2; CREATE VIEW v3 AS SELECT t1.f1,t1.f11 FROM t1 JOIN t1 AS t11 HAVING t1.f1<100; explain for simple derived EXPLAIN EXTENDED SELECT * FROM v1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` SELECT * FROM v1; f1 f11 1 1 2 2 3 3 5 5 7 7 9 9 explain showing created indexes and late materialization for views FLUSH STATUS; EXPLAIN EXTENDED SELECT * FROM t1 JOIN v2 ON f1=f2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 test.t1.f1 2 100.00 NULL 2 DERIVED t2 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`v2`.`f2` AS `f2`,`v2`.`f22` AS `f22` from `test`.`t1` join `test`.`v2` where (`v2`.`f2` = `test`.`t1`.`f1`) 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 0 FLUSH STATUS; SELECT * FROM t1 JOIN v2 ON f1=f2; f1 f11 f2 f22 1 1 1 1 2 2 2 2 3 3 3 3 SHOW STATUS LIKE 'Handler_read%'; Variable_name Value Handler_read_first 0 Handler_read_key 6 Handler_read_last 0 Handler_read_next 3 Handler_read_prev 0 Handler_read_rnd 6 Handler_read_rnd_next 21 EXPLAIN EXTENDED SELECT * FROM t1,v3 AS v31,v3 WHERE t1.f1=v31.f1 and t1.f1=v3.f1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 test.t1.f1 3 100.00 NULL 1 PRIMARY <derived3> ref <auto_key0> <auto_key0> 5 test.t1.f1 3 100.00 NULL 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 NULL 3 DERIVED t11 ALL NULL NULL NULL NULL 6 100.00 Using join buffer (Block Nested Loop) 2 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED t11 ALL NULL NULL NULL NULL 6 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`v31`.`f1` AS `f1`,`v31`.`f11` AS `f11`,`v3`.`f1` AS `f1`,`v3`.`f11` AS `f11` from `test`.`t1` join `test`.`v3` `v31` join `test`.`v3` where ((`v31`.`f1` = `test`.`t1`.`f1`) and (`v3`.`f1` = `test`.`t1`.`f1`)) FLUSH STATUS; SELECT * FROM t1,v3 AS v31,v3 WHERE t1.f1=v31.f1 and t1.f1=v3.f1; f1 f11 f1 f11 f1 f11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 SHOW STATUS LIKE 'Handler_read%'; Variable_name Value Handler_read_first 0 Handler_read_key 42 Handler_read_last 0 Handler_read_next 252 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 35 explain showing late materialization for views EXPLAIN EXTENDED SELECT * FROM v1 JOIN v4 ON f1=f2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 test.t2.f2 2 100.00 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`v1` join `test`.`t2` where ((`v1`.`f1` = `test`.`t2`.`f2`) and (`test`.`t2`.`f2` in (2,3))) SELECT * FROM v1 JOIN v4 ON f1=f2; f1 f11 f2 f22 3 3 3 3 2 2 2 2 merged derived in merged derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7) tt WHERE f1 > 2) zz; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED <derived3> ALL NULL NULL NULL NULL 6 100.00 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7)) `tt` where (`tt`.`f1` > 2)) `zz` SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7) tt WHERE f1 > 2) zz; f1 f11 3 3 5 5 materialized derived in merged derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2) zz; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED <derived3> ALL NULL NULL NULL NULL 6 100.00 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2)) `zz` SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2) zz; f1 f11 3 3 5 5 merged derived in materialized derived EXPLAIN extended SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7) tt WHERE f1 > 2 GROUP BY f1) zz; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED <derived3> ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7)) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `zz` SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7) tt WHERE f1 > 2 GROUP BY f1) zz; f1 f11 3 3 5 5 materialized derived in materialized derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2 GROUP BY f1) zz; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED <derived3> ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `zz` SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2 GROUP BY f1) zz; f1 f11 3 3 5 5 mat in merged derived join mat in merged derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2) x JOIN (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2) z ON x.f1 = z.f1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived4> ref <auto_key0> <auto_key0> 5 x.f1 2 100.00 NULL 4 DERIVED <derived5> ALL NULL NULL NULL NULL 6 100.00 Using where 5 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort 2 DERIVED <derived3> ALL NULL NULL NULL NULL 6 100.00 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `x`.`f1` AS `f1`,`x`.`f11` AS `f11`,`z`.`f1` AS `f1`,`z`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2)) `x` join (/* select#4 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#5 */ select `t1`.`f1` AS `f1`,`t1`.`f11` AS `f11` from `test`.`t1` where (`t1`.`f1` < 7) group by `t1`.`f1`) `tt` where (`tt`.`f1` > 2)) `z` where (`z`.`f1` = `x`.`f1`) FLUSH STATUS; SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2) x JOIN (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2) z ON x.f1 = z.f1; f1 f11 f1 f11 3 3 3 3 5 5 5 5 SHOW STATUS LIKE 'Handler_read%'; Variable_name Value Handler_read_first 0 Handler_read_key 2 Handler_read_last 0 Handler_read_next 2 Handler_read_prev 0 Handler_read_rnd 8 Handler_read_rnd_next 37 FLUSH STATUS; merged in merged derived join merged in merged derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 ) tt WHERE f1 > 2 ) x JOIN (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 ) tt WHERE f1 > 2 ) z ON x.f1 = z.f1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived4> ref <auto_key0> <auto_key0> 5 x.f1 2 100.00 NULL 4 DERIVED <derived5> ALL NULL NULL NULL NULL 6 100.00 Using where 5 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where 2 DERIVED <derived3> ALL NULL NULL NULL NULL 6 100.00 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `x`.`f1` AS `f1`,`x`.`f11` AS `f11`,`z`.`f1` AS `f1`,`z`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7)) `tt` where (`tt`.`f1` > 2)) `x` join (/* select#4 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#5 */ select `t1`.`f1` AS `f1`,`t1`.`f11` AS `f11` from `test`.`t1` where (`t1`.`f1` < 7)) `tt` where (`tt`.`f1` > 2)) `z` where (`z`.`f1` = `x`.`f1`) SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 ) tt WHERE f1 > 2 ) x JOIN (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 ) tt WHERE f1 > 2 ) z ON x.f1 = z.f1; f1 f11 f1 f11 3 3 3 3 5 5 5 5 materialized in materialized derived join materialized in materialized derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2 GROUP BY f1) x JOIN (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2 GROUP BY f1) z ON x.f1 = z.f1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived4> ref <auto_key0> <auto_key0> 5 x.f1 2 100.00 NULL 4 DERIVED <derived5> ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort 5 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort 2 DERIVED <derived3> ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `x`.`f1` AS `f1`,`x`.`f11` AS `f11`,`z`.`f1` AS `f1`,`z`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `x` join (/* select#4 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#5 */ select `t1`.`f1` AS `f1`,`t1`.`f11` AS `f11` from `test`.`t1` where (`t1`.`f1` < 7) group by `t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `z` where (`z`.`f1` = `x`.`f1`) SELECT * FROM (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2 GROUP BY f1) x JOIN (SELECT * FROM (SELECT * FROM t1 WHERE f1 < 7 GROUP BY f1) tt WHERE f1 > 2 GROUP BY f1) z ON x.f1 = z.f1; f1 f11 f1 f11 3 3 3 3 5 5 5 5 merged view in materialized derived EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM v4 GROUP BY 1) tt; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED t2 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `tt`.`f2` AS `f2`,`tt`.`f22` AS `f22` from (/* select#2 */ select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` where (`test`.`t2`.`f2` in (2,3)) group by 1) `tt` SELECT * FROM (SELECT * FROM v4 GROUP BY 1) tt; f2 f22 2 2 3 3 materialized view in merged derived EXPLAIN EXTENDED SELECT * FROM ( SELECT * FROM v1 WHERE f1 < 7) tt; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED <derived3> ALL NULL NULL NULL NULL 6 100.00 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#2 */ select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` where (`v1`.`f1` < 7)) `tt` SELECT * FROM ( SELECT * FROM v1 WHERE f1 < 7) tt; f1 f11 1 1 2 2 3 3 5 5 merged view in a merged view in a merged derived CREATE VIEW v6 AS SELECT * FROM v4 WHERE f2 < 7; EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM v6) tt; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED t2 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `tt`.`f2` AS `f2`,`tt`.`f22` AS `f22` from (/* select#2 */ select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` where ((`test`.`t2`.`f2` in (2,3)) and (`test`.`t2`.`f2` < 7))) `tt` SELECT * FROM (SELECT * FROM v6) tt; f2 f22 3 3 2 2 materialized view in a merged view in a materialized derived CREATE VIEW v7 AS SELECT * FROM v1; EXPLAIN EXTENDED SELECT * FROM (SELECT * FROM v7 GROUP BY 1) tt; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 100.00 NULL 2 DERIVED <derived4> ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort 4 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#2 */ select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` group by 1) `tt` SELECT * FROM (SELECT * FROM v7 GROUP BY 1) tt; f1 f11 1 1 2 2 3 3 5 5 7 7 9 9 JOIN of above two EXPLAIN EXTENDED SELECT * FROM v6 JOIN v7 ON f2=f1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 6 100.00 Using where 1 PRIMARY <derived5> ref <auto_key0> <auto_key0> 5 test.t2.f2 2 100.00 NULL 5 DERIVED t1 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22`,`v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`t2` join `test`.`v1` where ((`v1`.`f1` = `test`.`t2`.`f2`) and (`test`.`t2`.`f2` in (2,3)) and (`test`.`t2`.`f2` < 7)) SELECT * FROM v6 JOIN v7 ON f2=f1; f2 f22 f1 f11 3 3 3 3 2 2 2 2 test two keys CREATE TABLE t3(f3 INT, f33 INT); INSERT INTO t1 VALUES(6,6),(8,8); INSERT INTO t3 VALUES(1,1),(2,2),(3,3),(5,5); EXPLAIN EXTENDED SELECT * FROM t1 JOIN (SELECT * FROM t2) tt ON t1.f1=tt.f2 JOIN t3 ON tt.f22=t3.f3; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY <derived2> ref <auto_key2> <auto_key2> 5 test.t3.f3 2 100.00 NULL 1 PRIMARY t1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop) 2 DERIVED t2 ALL NULL NULL NULL NULL 6 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`tt`.`f2` AS `f2`,`tt`.`f22` AS `f22`,`test`.`t3`.`f3` AS `f3`,`test`.`t3`.`f33` AS `f33` from `test`.`t1` join (/* select#2 */ select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2`) `tt` join `test`.`t3` where ((`test`.`t1`.`f1` = `tt`.`f2`) and (`tt`.`f22` = `test`.`t3`.`f3`)) SELECT * FROM t1 JOIN (SELECT * FROM t2) tt ON t1.f1=tt.f2 JOIN t3 ON tt.f22=t3.f3; f1 f11 f2 f22 f3 f33 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 DROP TABLE t1,t2,t3; DROP VIEW v1,v2,v3,v4,v6,v7; # # # BUG#11783262: CRASH IN ITEM_FIELD::ITEM_FIELD IN ITEM.CC ON SUBQUERY # IN FROM WITH WL5274 # CREATE TABLE t1 ( col_int_key INT, col_time_key time, col_varchar_key VARCHAR(1), KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ) ENGINE=INNODB; SELECT alias1.col_time_key AS field1 FROM ( ( SELECT SQ1_alias1.* FROM t1 AS SQ1_alias1 ) AS alias1 INNER JOIN t1 AS alias2 ON (alias2.col_int_key = alias1.col_int_key) ) WHERE alias1.col_int_key = 207 ORDER BY alias1.col_varchar_key, field1; field1 DROP TABLE t1; # # Bug#11807437: VALGRIND WARNING IN MYSQL_DERIVED_OPTIMIZE() LINE 293 # CREATE TABLE t1 ( f1 int(11) DEFAULT NULL ); SELECT 1 FROM ( SELECT 1, 2 FROM DUAL WHERE EXISTS ( SELECT f1 FROM t1 )) AS tt ; 1 DROP TABLE t1; # # # Bug#11808582: VALGRIND ON WL#5274: INVALID WRITE IN MC_REPLACE_STRMEM.C:493) # CREATE TABLE t1 ( pk INT NOT NULL AUTO_INCREMENT, col_int_key INT, col_time_key time, 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=InnoDB; SELECT tt.col_time_key FROM ( ( SELECT * FROM t1 ) AS tt INNER JOIN t1 ON (t1.col_int_key = tt.col_int_key) ) WHERE tt.col_int_key = 207 ORDER BY tt.col_varchar_key, tt.pk ASC, 1; col_time_key DROP TABLE t1; # # Bug#11791677 - ASSERTION FAILED IN JOIN_MATERIALIZE_TABLE IN # SQL_SELECT.CC ON NESTED SUBQUERY # CREATE TABLE t1 ( pk int(11) NOT NULL AUTO_INCREMENT, col_int_key int(11) DEFAULT NULL, col_varchar_key varchar(1) DEFAULT NULL, PRIMARY KEY (pk), KEY col_varchar_key (col_varchar_key,col_int_key) ); INSERT INTO t1 VALUES (10,8,'v'), (29,4,'c'); CREATE TABLE t2 ( pk int(11) NOT NULL AUTO_INCREMENT, col_int_nokey int(11) DEFAULT NULL, col_varchar_key varchar(1) DEFAULT NULL, PRIMARY KEY (pk) ); INSERT INTO t2 VALUES (16,1,'c'), (20,4,'d'); CREATE TABLE t3 ( `field1` varchar(1) DEFAULT NULL, `field2` int(11) DEFAULT NULL ); INSERT INTO t3 VALUES ('m',6),('c',4); SELECT * FROM t3 WHERE (field1, field2) IN ( SELECT t1.col_varchar_key AS field1, t1.col_int_key AS field2 FROM ( t1 INNER JOIN ( SELECT t2.* FROM t2 WHERE t2.col_int_nokey < t2.pk ) AS alias2 ON (alias2.col_varchar_key = t1.col_varchar_key ) ) GROUP BY field1, field2 ORDER BY t1.col_int_key, t1 .pk DESC ) ; field1 field2 c 4 DROP TABLE t1,t2,t3; # # # Bug#11791705 - CRASH IN JOIN_MATERIALIZE_TABLE OR ASSERTION FAIL: # !TAB->SAVE_READ_FIRST_RECORD # CREATE TABLE t1 (a INTEGER); INSERT INTO t1 VALUES (NULL),(NULL); SELECT * FROM t1 WHERE (a, a) NOT IN (SELECT * FROM (SELECT 8, 4 UNION SELECT 2, 3) tt) ; a DROP TABLE t1; # # Bug#11791649 - ASSERT: FIXED == 0, IN ITEM.CC ON EXPLAIN WITH VIEW # IN SUBQUERY # CREATE TABLE t1 (pk int); INSERT INTO t1 VALUES (1); CREATE TABLE t2 (col_varchar_nokey varchar(1)); INSERT INTO t2 VALUES ('m'), ('f'); EXPLAIN SELECT pk FROM t1 WHERE (2) IN ( SELECT * FROM (SELECT COUNT(col_varchar_nokey) FROM t2) d ) ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 NULL 1 PRIMARY <derived3> ALL NULL NULL NULL NULL 1 Using where; FirstMatch(t1) 3 DERIVED t2 ALL NULL NULL NULL NULL 2 NULL DROP TABLE t1,t2; # # # Bug#12735934 - Lost LIMIT clause caused wrong result. # CREATE TABLE t1 (f1 VARCHAR(1), key(f1)); INSERT INTO t1 VALUES ('a'); CREATE VIEW v1 AS SELECT f1 FROM t1 ORDER BY 1 LIMIT 0; SELECT * FROM v1; f1 DROP VIEW v1; DROP TABLE t1; # # # Bug#12726927: An outdated assertion caused server failure. # CREATE TABLE t1 ( pk int(11) NOT NULL AUTO_INCREMENT, col_int_nokey int(11) NOT NULL, col_varchar_key varchar(1) NOT NULL, PRIMARY KEY (pk), KEY col_varchar_key (col_varchar_key) ) ENGINE=MyISAM; INSERT INTO t1 VALUES (10,1,'v'), (24,18,'h'); CREATE TABLE t2 ( pk int(11) NOT NULL AUTO_INCREMENT, col_date_key date NOT NULL, col_date_nokey date NOT NULL, col_time_nokey time NOT NULL, col_varchar_key varchar(1) NOT NULL, col_varchar_nokey varchar(1) NOT NULL, PRIMARY KEY (pk), KEY col_date_key (col_date_key), KEY col_varchar_key (col_varchar_key) ) ENGINE=MyISAM; INSERT INTO t2 VALUES (1,'1900-01-01','1900-01-01','00:00:00','k','k'); SELECT OUTR.col_date_key FROM t2 AS OUTR2 LEFT JOIN t2 AS OUTR ON OUTR2.pk < OUTR.pk WHERE ( OUTR.col_varchar_nokey , OUTR.col_varchar_key ) IN ( SELECT DISTINCT col_varchar_key , col_varchar_key FROM t1 WHERE col_int_nokey XOR OUTR.col_time_nokey ) XOR OUTR.col_date_nokey IS NULL ; col_date_key NULL DROP TABLE t1,t2; # # # Bug#12799731 - CRASH IN END_READ_RECORD. # create table t1(f1 char(255) charset utf8); insert into t1 values('1'),('2'),('3'),('4'),('5'),('6'),('7'),('8'),('9'),('0'); set @save_heap_size= @@max_heap_table_size; set @@max_heap_table_size= 1; Warnings: Warning 1292 Truncated incorrect max_heap_table_size value: '1' flush status; select count(*) from t1 join ( select t1.f1 from t1 join t1 as t2 join t1 as t3) tt on t1.f1 = tt.f1; count(*) 1000 Should be greater than 1000 as it also includes records dumped from heap to myisam. show status like 'Handler_write'; Variable_name Value Handler_write 1021 set @@max_heap_table_size= @save_heap_size; drop table t1; # # # Bug#12896124: Crash on rqg_mdl_stability test # CREATE TABLE t1(f1 INT); INSERT INTO t1 VALUES (1),(2),(3); CREATE FUNCTION func1 (param1 INTEGER) RETURNS INT NOT DETERMINISTIC return param1; CREATE FUNCTION func2 (param1 INTEGER) RETURNS INT return param1; SELECT * FROM (SELECT * FROM t1) tt WHERE f1 = func1(f1); f1 1 2 3 EXPLAIN SELECT * FROM (SELECT * FROM t1) tt WHERE f1 = func1(f1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 3 NULL SELECT * FROM (SELECT * FROM t1) tt WHERE f1 = func2(f1); f1 1 2 3 EXPLAIN SELECT * FROM (SELECT * FROM t1) tt WHERE f1 = func2(f1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 3 NULL DROP FUNCTION func1; DROP FUNCTION func2; DROP TABLE t1; # # # Bug#12909844: Missing type cast caused false assertion # CREATE TABLE t1 ( fk INT) ENGINE=INNODB; CREATE TABLE t2 ( f1 INT, f2 INT, f3 INT, f4 INT, f5 INT, f6 INT, f7 INT, f8 INT, f9 INT, f10 INT, f11 INT, f12 INT, f13 INT, f14 INT, f15 INT, f16 INT, f17 INT, f18 INT, f19 INT, f20 INT, f21 INT, f22 INT, f23 INT, f24 INT, f25 INT, f26 INT, f27 INT, f28 INT, f29 INT, f30 INT, f31 INT, f32 TEXT, fk INT) ENGINE=INNODB; SELECT alias2.fk AS field1 FROM t1 AS alias1 JOIN (SELECT * FROM t2 ) AS alias2 ON alias1.fk = alias2.fk; field1 EXPLAIN SELECT alias2.fk AS field1 FROM t1 AS alias1 JOIN (SELECT * FROM t2 ) AS alias2 ON alias1.fk = alias2.fk; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY alias1 ALL NULL NULL NULL NULL 1 Using where 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 test.alias1.fk 2 NULL 2 DERIVED t2 ALL NULL NULL NULL NULL 1 NULL DROP TABLE t1, t2; # # # Bug#12910039: Incorrect merge caused segmentation fault. # CREATE TABLE t1 (f1 int) ENGINE=myisam; CREATE TABLE t2 (f1 text) ENGINE=innodb; SELECT 1 FROM ( ( SELECT * FROM ( SELECT * FROM t2 ) AS alias1 ) AS alias1, ( SELECT * FROM t1 ) AS alias2 ); 1 DROP TABLE t1,t2; # # # Bug#12910006: MRR initialization on a derived table caused crash. # SET @save_switch= @@SESSION.optimizer_switch; SET @@SESSION.optimizer_switch="batched_key_access=on"; CREATE TABLE t1 ( pk integer auto_increment, col_blob_key blob, primary key (pk)) ENGINE=innodb; CREATE TABLE t2 (col_tinytext tinytext null, pk integer auto_increment, col_text text, col_blob blob, primary key (pk)) ENGINE=innodb; SELECT alias1.col_text AS field1 , alias1.col_tinytext AS field2 FROM t2 AS alias1 LEFT OUTER JOIN ( SELECT * FROM t1 ) AS alias2 ON alias1.pk = alias2.pk WHERE alias2.pk >=1 AND alias2.pk < 3 ORDER BY field1,field2 ASC; field1 field2 SET @@SESSION.optimizer_switch= @save_switch; DROP TABLE t1, t2; # # Bug#13106350: MRR initialization on a derived table caused crash. # CREATE TABLE t1 (pk INTEGER PRIMARY KEY, vc VARCHAR(20)); INSERT INTO t1 VALUES(7, 'seven'), (13, 'thirteen'); CREATE TABLE t2 (pk INTEGER PRIMARY KEY, vc1 VARCHAR(20), vc2 VARCHAR(20)); INSERT INTO t2 VALUES(7, 'seven', 's'), (14, 'fourteen', 'f'); CREATE TABLE t3 (pk INTEGER PRIMARY KEY, vc VARCHAR(20)); INSERT INTO t3 VALUES(5, 'f'), (6, 's'), (7, 's'); explain SELECT derived.vc FROM (SELECT * FROM t1) AS derived WHERE derived.vc IN ( SELECT t2.vc1 FROM t2 JOIN t3 ON t2.vc2=t3.vc); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <subquery3> ALL NULL NULL NULL NULL NULL Using where 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 23 <subquery3>.vc1 2 NULL 3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 NULL 3 MATERIALIZED t3 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (Block Nested Loop) 2 DERIVED t1 ALL NULL NULL NULL NULL 2 NULL SELECT derived.vc FROM (SELECT * FROM t1) AS derived WHERE derived.vc IN ( SELECT t2.vc1 FROM t2 JOIN t3 ON t2.vc2=t3.vc); vc seven DROP TABLE t1, t2, t3; # # # Bug#13107577: Derived table in a semi-join caused failed assertion. # CREATE TABLE t1 ( `col_int_key` int(11) NOT NULL, `col_varchar_nokey` varchar(1) NOT NULL ) ENGINE=MyISAM; INSERT INTO t1 VALUES (8,'m'), (4,'b'), (4,'x'), (7,'g'), (4,'p'); CREATE VIEW v1 AS SELECT * FROM t1; SELECT col_int_key FROM t1 WHERE ( NOT EXISTS ( SELECT col_varchar_nokey FROM t1 WHERE ( 7 ) IN ( SELECT v1.col_int_key FROM ( v1 JOIN ( SELECT * FROM t1 ) AS d1 ON ( d1.col_varchar_nokey = v1.col_varchar_nokey ) ) ) ) ) ; col_int_key DROP VIEW v1; DROP TABLE t1; # # # Bug#13105833: Crash when using LooseScan sj-strategy for a view. # CREATE TABLE t1 (pk int(11)) ENGINE=InnoDB; INSERT INTO t1 VALUES (1); CREATE TABLE t2 (pk int(11)) ENGINE=InnoDB; INSERT INTO t2 VALUES (1), (2), (3); CREATE VIEW v1 AS SELECT DISTINCT pk FROM t1; SELECT pk FROM t2 WHERE pk IN ( SELECT * FROM v1 ) ; pk 1 DROP TABLE t1,t2; DROP VIEW v1; # # # Bug#13261277: Unchecked key length caused missing records. # CREATE TABLE t1 ( col_varchar varchar(1024) CHARACTER SET utf8 DEFAULT NULL, stub1 varchar(1024) CHARACTER SET utf8 DEFAULT NULL, stub2 varchar(1024) CHARACTER SET utf8 DEFAULT NULL, stub3 varchar(1024) CHARACTER SET utf8 DEFAULT NULL ); INSERT INTO t1 VALUES ('d','d','l','ther'), (NULL,'s','NJBIQ','trzetuchv'), (-715390976,'coul','MYWFB','cfhtrzetu'), (1696792576,'f','i\'s','c'), (1,'i','ltpemcfhtr','gsltpemcf'), (-663027712,'mgsltpemcf','sa','amgsltpem'), (-1686700032,'JPRVK','i','vamgsltpe'), (NULL,'STUNB','UNVJV','u'), (5,'oka','qyihvamgsl','AXSMD'), (NULL,'tqwmqyihva','h','yntqwmqyi'), (3,'EGMJN','e','e'); CREATE TABLE t2 ( col_varchar varchar(10) DEFAULT NULL, col_int INT DEFAULT NULL ); INSERT INTO t2 VALUES ('d',9); SET @save_heap_size= @@max_heap_table_size; SET @@max_heap_table_size= 16384; SELECT t2.col_int FROM t2 RIGHT JOIN ( SELECT * FROM t1 ) AS dt ON t2.col_varchar = dt.col_varchar WHERE t2.col_int IS NOT NULL ; col_int 9 # Shouldn't use auto_key0 for derived table EXPLAIN SELECT t2.col_int FROM t2 RIGHT JOIN ( SELECT * FROM t1 ) AS dt ON t2.col_varchar = dt.col_varchar WHERE t2.col_int IS NOT NULL ; 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 <derived2> ALL NULL NULL NULL NULL 11 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 11 NULL SET @@max_heap_table_size= @save_heap_size; DROP TABLE t1,t2; # # # Bug#13383857: Another crash in memcpy from # join_cache::write_record_data with semijoin # CREATE TABLE t1 ( col_int_key INT DEFAULT NULL, col_time_nokey TIME DEFAULT NULL, col_varchar_key VARCHAR(1) DEFAULT NULL, col_varchar_nokey VARCHAR(1) DEFAULT NULL, KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ); INSERT INTO t1 VALUES (8,'22:55:23','x','x'), (7,'10:19:31','d','d'), (1,'14:40:36','r','r'), (7,'04:37:47','f','f'), (9,'19:34:06','y','y'), (NULL,'20:35:33','u','u'), (1,NULL,'m','m'), (9,'14:43:37',NULL,NULL), (2,'02:23:09','o','o'), (9,'01:22:45','w','w'), (2,'00:00:00','m','m'), (4,'00:13:25','q','q'), (0,'03:47:16',NULL,NULL), (4,'01:41:48','d','d'), (8,'00:00:00','g','g'), (NULL,'22:32:04','x','x'), (NULL,'16:44:14','f','f'), (0,'17:38:37','p','p'), (NULL,'08:46:48','j','j'), (8,'14:11:27','c','c'); CREATE TABLE t2 ( col_int_key INT DEFAULT NULL, col_time_nokey TIME DEFAULT NULL, col_varchar_key VARCHAR(1) DEFAULT NULL, col_varchar_nokey VARCHAR(1) DEFAULT NULL, KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ); INSERT INTO t2 VALUES (4,'22:34:09','v','v'), (62,'14:26:02','v','v'), (7,'14:03:03','c','c'), (1,'01:46:09',NULL,NULL), (0,'16:21:18','x','x'), (7,'18:56:33','i','i'), (7,NULL,'e','e'), (1,'09:29:08','p','p'), (7,'19:11:10','s','s'), (1,'11:57:26','j','j'), (5,'00:39:46','z','z'), (2,'03:28:15','c','c'), (0,'06:44:18','a','a'), (1,'14:36:39','q','q'), (8,'18:42:45','y','y'), (1,'02:57:29',NULL,NULL), (1,'16:46:13','r','r'), (9,'19:39:02','v','v'), (1,NULL,NULL,NULL), (5,'20:58:33','r','r'); CREATE TABLE t3 ( col_int_key INT DEFAULT NULL, col_time_nokey TIME DEFAULT NULL, col_varchar_key VARCHAR(1) DEFAULT NULL, col_varchar_nokey VARCHAR(1) DEFAULT NULL, KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key,col_int_key) ); INSERT INTO t3 VALUES (8,'04:07:22','g','g'); explain SELECT col_time_nokey AS x FROM (SELECT * FROM t2) AS outr WHERE col_varchar_nokey IN ( SELECT innr.col_varchar_key FROM (SELECT * FROM t3) AS innr2 LEFT JOIN (SELECT * FROM t1) AS innr ON innr2.col_varchar_key >= innr.col_varchar_key WHERE outr.col_varchar_nokey = 'e' ) AND outr.col_varchar_key <> 'r' ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived4> ALL NULL NULL NULL NULL 1 Using where; Start temporary 1 PRIMARY <derived5> ref <auto_key0> <auto_key0> 4 const 2 Using where 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 20 Using where; End temporary; Using join buffer (Block Nested Loop) 5 DERIVED t1 ALL NULL NULL NULL NULL 20 NULL 4 DERIVED t3 system NULL NULL NULL NULL 1 NULL 2 DERIVED t2 ALL NULL NULL NULL NULL 20 NULL SELECT col_time_nokey AS x FROM (SELECT * FROM t2) AS outr WHERE col_varchar_nokey IN ( SELECT innr.col_varchar_key FROM (SELECT * FROM t3) AS innr2 LEFT JOIN (SELECT * FROM t1) AS innr ON innr2.col_varchar_key >= innr.col_varchar_key WHERE outr.col_varchar_nokey = 'e' ) AND outr.col_varchar_key <> 'r' ; x DROP TABLE t1, t2, t3; # # Bug#13354889: Crash on a derived table with more than 64 fields. # create table t1 ( field00 int, field01 int, field02 int, field03 int, field04 int, field05 int, field06 int, field07 int, field10 int, field11 int, field12 int, field13 int, field14 int, field15 int, field16 int, field17 int, field20 int, field21 int, field22 int, field23 int, field24 int, field25 int, field26 int, field27 int, field30 int, field31 int, field32 int, field33 int, field34 int, field35 int, field36 int, field37 int, field40 int, field41 int, field42 int, field43 int, field44 int, field45 int, field46 int, field47 int, field50 int, field51 int, field52 int, field53 int, field54 int, field55 int, field56 int, field57 int, field60 int, field61 int, field62 int, field63 int, field64 int, field65 int, field66 int, field67 int, field70 int, field71 int, field72 int, field73 int, field74 int, field75 int, field76 int, field77 int, field100 int ); insert into t1(field100) values (1),(2),(3),(4),(5),(6),(7),(8),(9),(0); insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 select * from t1; select tt.field100 from t1 join (select * from t1) tt where t1.field100=tt.field100 limit 1; field100 1 Should use auto_key0 and ref access. explain select tt.field100 from t1 join (select * from t1) tt where t1.field100=tt.field100 limit 1; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 80 Using where 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 test.t1.field100 8 NULL 2 DERIVED t1 ALL NULL NULL NULL NULL 80 NULL drop table t1; # # # Bug#13390138: crash in memcpy from join_cache::write_record_data # CREATE TABLE t1 ( col_varchar_key varchar(1), col_varchar_nokey varchar(1), KEY col_varchar_key (col_varchar_key) ) ENGINE=MyISAM; INSERT INTO t1 VALUES ('r','r'); CREATE TABLE t2 ( col_varchar_key varchar(1), col_varchar_nokey varchar(1), KEY col_varchar_key (col_varchar_key) ); INSERT INTO t2 VALUES (NULL,NULL), ('r','r'); CREATE TABLE t3 ( col_int_key int, col_varchar_key varchar(1), col_varchar_nokey varchar(1), KEY col_int_key (col_int_key), KEY col_varchar_key (col_varchar_key, col_int_key) ); INSERT INTO t3 VALUES (9,'f','f'), (4,'y','y'), (3,'u','u'), (2,'m','m'), (NULL,NULL,NULL), (2,'o','o'), (NULL,'r','r'), (6,'m','m'), (7,'q','q'), (6,'c','c'); explain SELECT grandparent.col_varchar_nokey AS g1 FROM (SELECT * FROM t3) AS grandparent WHERE grandparent.col_varchar_nokey IN (SELECT parent.col_varchar_key AS p1 FROM (SELECT * FROM t2) AS parent WHERE grandparent.col_varchar_key IN ( SELECT child1.col_varchar_key AS c1 FROM (SELECT * FROM t1) AS child1 LEFT JOIN (SELECT * FROM t2) AS child2 ON child1.col_varchar_nokey <> child2.col_varchar_key ) AND grandparent.col_int_key IS UNKNOWN ) ORDER BY grandparent.col_varchar_nokey; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 const 2 Using where; Using index; Using temporary; Using filesort; Start temporary 1 PRIMARY <derived6> ALL NULL NULL NULL NULL 1 Using where; Using join buffer (Block Nested Loop) 1 PRIMARY <derived4> ref <auto_key0> <auto_key0> 4 grandparent.col_varchar_nokey 2 NULL 1 PRIMARY <derived7> ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (Block Nested Loop) 7 DERIVED t2 ALL NULL NULL NULL NULL 2 NULL 6 DERIVED t1 system NULL NULL NULL NULL 1 NULL 4 DERIVED t2 ALL NULL NULL NULL NULL 2 NULL 2 DERIVED t3 ALL NULL NULL NULL NULL 10 NULL SELECT grandparent.col_varchar_nokey AS g1 FROM (SELECT * FROM t3) AS grandparent WHERE grandparent.col_varchar_nokey IN (SELECT parent.col_varchar_key AS p1 FROM (SELECT * FROM t2) AS parent WHERE grandparent.col_varchar_key IN ( SELECT child1.col_varchar_key AS c1 FROM (SELECT * FROM t1) AS child1 LEFT JOIN (SELECT * FROM t2) AS child2 ON child1.col_varchar_nokey <> child2.col_varchar_key ) AND grandparent.col_int_key IS UNKNOWN ) ORDER BY grandparent.col_varchar_nokey; g1 r DROP TABLE t1, t2, t3; # # Bug#13457552: Crash on instantiating a derived table in a query with # empty result. # CREATE TABLE t1 ( pk INT, col_blob BLOB ) ENGINE = MyISAM; CREATE TABLE t2 ( pk INT, col_blob BLOB ) ENGINE = InnoDB; SELECT pk FROM ( SELECT col_blob, pk FROM t2 ) AS A NATURAL JOIN t1; pk EXPLAIN SELECT pk FROM ( SELECT col_blob, pk FROM t2 ) AS A NATURAL JOIN t1; 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 DERIVED t2 ALL NULL NULL NULL NULL 1 NULL DROP TABLE t1,t2; # # Bug #13801019 ASSERTION `0' FAILED IN CREATE_MYISAM_TMP_TABLE # CREATE TABLE t1 (a INT, b BLOB) ENGINE=InnoDB; CREATE TABLE t2 (c INT); CREATE TABLE t3 (d INT); INSERT INTO t3 VALUES (0); SELECT * FROM (SELECT * FROM t1) AS a1 RIGHT JOIN t3 LEFT JOIN t2 ON d=c ON a=c; a b d c NULL NULL 0 NULL DROP TABLE t1, t2, t3; # # Bug #17814492 - INVALID RESULTS FROM SUBQUERY WITH IN CLAUSE # CREATE TABLE t1 ( a INTEGER NOT NULL, b VARCHAR(1000) NOT NULL, c TEXT NOT NULL )ENGINE=InnoDB; INSERT INTO t1 VALUES (1, 'xxx', 'abc'); INSERT INTO t1 VALUES (2, 'yyy', 'abc'); INSERT INTO t1 SELECT a, b, c FROM t1 WHERE b='yyy'; INSERT INTO t1 SELECT a, b, c FROM t1 WHERE b='yyy'; INSERT INTO t1 SELECT a, b, c FROM t1 WHERE b='yyy'; CREATE TABLE t2 ( a INTEGER NOT NULL )ENGINE=InnoDB; INSERT INTO t2 VALUES (1), (2); SET @save_optimizer_switch= @@optimizer_switch; SET @@SESSION.optimizer_switch="index_condition_pushdown=on"; EXPLAIN SELECT a1.a, a1.b, a1.c FROM (SELECT a, b, c FROM t1 ) a1 JOIN t2 ON a1.a=t2.a WHERE a1.b='xxx'; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 NULL 1 PRIMARY <derived2> ref <auto_key1> <auto_key1> 4 test.t2.a 2 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 9 NULL SELECT a1.a, a1.b, a1.c FROM (SELECT a, b, c FROM t1 ) a1 JOIN t2 ON a1.a=t2.a WHERE a1.b='xxx'; a b c 1 xxx abc SET @@SESSION.optimizer_switch= @save_optimizer_switch; DROP TABLE t2, t1; # End of test for Bug #17814492 # # Bug #18607971 : 5.5 TO 5.6 REGRESSION WITH A SUBQUERY IN THE FROM # CLAUSE. # CREATE TABLE t(id INT PRIMARY KEY, c1 INT, c2 INT, key(c2)) engine=InnoDB; INSERT INTO t(id, c1, c2) VALUES(1, 2, 3), (2, 3, 4), (3, 3, 4), (4, 3, 4); ANALYZE TABLE t; Table Op Msg_type Msg_text test.t analyze status OK EXPLAIN SELECT * FROM (SELECT t1.c1 FROM t t1 INNER JOIN t t2 ON t1.c1= 3 GROUP BY t1.c1) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where 2 DERIVED t2 index NULL c2 5 NULL 4 Using index; Using join buffer (Block Nested Loop) EXPLAIN SELECT * FROM (SELECT t1.id FROM t t1 INNER JOIN t t2 ON t1.id=1 AND t1.c1=t2.id GROUP BY t1.id, t2.c2) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 const PRIMARY PRIMARY 4 const 1 NULL 2 DERIVED t2 const PRIMARY PRIMARY 4 const 1 NULL EXPLAIN SELECT * FROM (SELECT t1.c1 FROM t t1 INNER JOIN t t2 ON t1.c1= 3 AND t2.c2= 3 GROUP BY t1.c1) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t2 ref c2 c2 5 const 1 Using index 2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where; Using join buffer (Block Nested Loop) EXPLAIN SELECT * FROM (SELECT t1.c1 FROM t t1 INNER JOIN t t2 ON t1.c1= 3 AND t2.c2= 3 GROUP BY t1.c1, t2.c2) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t2 ref c2 c2 5 const 1 Using index 2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where; Using join buffer (Block Nested Loop) EXPLAIN SELECT * FROM (SELECT t1.c1 FROM t t1 INNER JOIN t t2 ON t1.c1= 3 AND t2.c2= 3 GROUP BY t1.c1, t1.id) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 Using join buffer (Block Nested Loop) 2 DERIVED t2 ref c2 c2 5 const 1 Using index; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where; Using join buffer (Block Nested Loop) EXPLAIN SELECT * FROM (SELECT t1.id FROM t t1 INNER JOIN t t2 ON t1.id=1 AND t1.c1=t2.c1 GROUP BY t2.c1, t1.id) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 const PRIMARY PRIMARY 4 const 1 NULL 2 DERIVED t2 ALL NULL NULL NULL NULL 4 Using where EXPLAIN SELECT * FROM (SELECT t1.id FROM t t1 INNER JOIN t t2 ON t1.id=1 AND t1.c1=t2.id GROUP BY t2.c1, t1.id) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 const PRIMARY PRIMARY 4 const 1 NULL 2 DERIVED t2 const PRIMARY PRIMARY 4 const 1 NULL EXPLAIN SELECT * FROM (SELECT t1.id FROM t t1 INNER JOIN t t2 ON t1.id=1 AND t1.c1=t2.id GROUP BY t2.c2, t1.id) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 const PRIMARY PRIMARY 4 const 1 NULL 2 DERIVED t2 const PRIMARY PRIMARY 4 const 1 NULL EXPLAIN SELECT * FROM (SELECT t1.id FROM t t1 INNER JOIN t t2 ON t1.id=1 AND t1.c1=t2.id GROUP BY t1.id, t2.c2) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 const PRIMARY PRIMARY 4 const 1 NULL 2 DERIVED t2 const PRIMARY PRIMARY 4 const 1 NULL EXPLAIN SELECT * FROM (SELECT t1.id FROM t t1 INNER JOIN t t2 INNER JOIN t t3 ON t1.id=1 AND t1.c1=t2.id AND t2.c1=t3.id GROUP BY t1.id, t2.c2, t3.c2) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 const PRIMARY PRIMARY 4 const 1 NULL 2 DERIVED t2 const PRIMARY PRIMARY 4 const 1 NULL 2 DERIVED t3 const PRIMARY PRIMARY 4 const 1 NULL EXPLAIN SELECT * FROM (SELECT DISTINCT t1.id FROM t t1 WHERE t1.id= 1) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 const PRIMARY PRIMARY 4 const 1 Using index EXPLAIN SELECT * FROM (SELECT t1.id + 1 FROM t t1 INNER JOIN t t2 ON t1.id= 1 GROUP BY t1.id + 1) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 const PRIMARY PRIMARY 4 const 1 Using index 2 DERIVED t2 index NULL c2 5 NULL 4 Using index EXPLAIN SELECT * FROM (SELECT t1.c1 FROM t t1 INNER JOIN t t2 ON t1.c1= 3 GROUP BY 1.5) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where 2 DERIVED t2 index NULL c2 5 NULL 4 Using index; Using join buffer (Block Nested Loop) EXPLAIN SELECT * FROM (SELECT t1.id FROM t t1 INNER JOIN t t2 ON mod(t1.id,1000)= 1 GROUP BY t1.id) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 16 Using join buffer (Block Nested Loop) 2 DERIVED t1 index PRIMARY,c2 c2 5 NULL 4 Using where; Using index; Using temporary; Using filesort 2 DERIVED t2 index NULL c2 5 NULL 4 Using index; Using join buffer (Block Nested Loop) EXPLAIN SELECT * FROM (SELECT t1.id + 1 FROM t t1 INNER JOIN t t2 ON t1.id + 1= 2 GROUP BY t1.id + 1) a, t b WHERE b.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY b range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t1 index PRIMARY,c2 c2 5 NULL 4 Using where; Using index 2 DERIVED t2 index NULL c2 5 NULL 4 Using index; Using join buffer (Block Nested Loop) CREATE VIEW v1 AS SELECT c1 a FROM t WHERE c1 = 3; CREATE VIEW v2 AS SELECT c2 b FROM t WHERE c2 > 3; EXPLAIN SELECT * FROM (SELECT v1.a FROM v1 LEFT OUTER JOIN v2 ON v1.a = v2.b GROUP BY v1.a) p, t q WHERE q.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY q range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t ALL NULL NULL NULL NULL 4 Using where 2 DERIVED t ref c2 c2 5 const 1 Using where; Using index DROP VIEW v1; CREATE VIEW v1 AS SELECT c1 a FROM t; EXPLAIN SELECT * FROM (SELECT v1.a FROM v1 LEFT OUTER JOIN v2 ON v1.a = v2.b AND v1.a = 10 GROUP BY v1.a) p, t q WHERE q.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY q range PRIMARY PRIMARY 4 NULL 4 Using where 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 Using join buffer (Block Nested Loop) 2 DERIVED t ALL NULL NULL NULL NULL 4 Using temporary; Using filesort 2 DERIVED t ref c2 c2 5 func 1 Using where; Using index EXPLAIN SELECT * FROM (SELECT v1.a FROM v1 LEFT OUTER JOIN v2 ON v1.a = v2.b WHERE v1.a = 3 GROUP BY v1.a) p, t q WHERE q.id BETWEEN 1 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 NULL 1 PRIMARY q range PRIMARY PRIMARY 4 NULL 4 Using where 2 DERIVED t ALL NULL NULL NULL NULL 4 Using where 2 DERIVED t ref c2 c2 5 const 1 Using where; Using index DROP VIEW v1, v2; DROP TABLE t;