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drop table if exists t1,t2; set @a := foo; ERROR 42S22: Unknown column 'foo' in 'field list' set @a := connection_id() + 3; select @a - connection_id(); @a - connection_id() 3 set @b := 1; select @b; @b 1 CREATE TABLE t1 ( i int not null, v int not null,index (i)); insert into t1 values (1,1),(1,3),(2,1); create table t2 (i int not null, unique (i)); insert into t2 select distinct i from t1; select * from t2; i 1 2 select distinct t2.i,@vv1:=if(sv1.i,1,0),@vv2:=if(sv2.i,1,0),@vv3:=if(sv3.i,1,0), @vv1+@vv2+@vv3 from t2 left join t1 as sv1 on sv1.i=t2.i and sv1.v=1 left join t1 as sv2 on sv2.i=t2.i and sv2.v=2 left join t1 as sv3 on sv3.i=t2.i and sv3.v=3; i @vv1:=if(sv1.i,1,0) @vv2:=if(sv2.i,1,0) @vv3:=if(sv3.i,1,0) @vv1+@vv2+@vv3 1 1 0 1 2 2 1 0 0 1 explain select * from t1 where i=@vv1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref i i 4 const 1 NULL select @vv1,i,v from t1 where i=@vv1; @vv1 i v 1 1 1 1 1 3 explain select * from t1 where @vv1:=@vv1+1 and i=@vv1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where explain select @vv1:=i from t1 where i=@vv1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL i 4 NULL 3 Using where; Using index explain select * from t1 where i=@vv1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref i i 4 const 1 NULL drop table t1,t2; set @a=0,@b=0; select @a:=10, @b:=1, @a > @b, @a < @b; @a:=10 @b:=1 @a > @b @a < @b 10 1 1 0 select @a:="10", @b:="1", @a > @b, @a < @b; @a:="10" @b:="1" @a > @b @a < @b 10 1 1 0 select @a:=10, @b:=2, @a > @b, @a < @b; @a:=10 @b:=2 @a > @b @a < @b 10 2 0 1 select @a:="10", @b:="2", @a > @b, @a < @b; @a:="10" @b:="2" @a > @b @a < @b 10 2 1 0 select @a:=1; @a:=1 1 select @a, @a:=1; @a @a:=1 1 1 create table t1 (id int, d double, c char(10)); insert into t1 values (1,2.0, "test"); select @c:=0; @c:=0 0 update t1 SET id=(@c:=@c+1); select @c; @c 1 select @c:=0; @c:=0 0 update t1 set id=(@c:=@c+1); select @c; @c 1 select @c:=0; @c:=0 0 select @c:=@c+1; @c:=@c+1 1 select @d,(@d:=id),@d from t1; @d (@d:=id) @d NULL 1 1 select @e,(@e:=d),@e from t1; @e (@e:=d) @e NULL 2 2 select @f,(@f:=c),@f from t1; @f (@f:=c) @f NULL test test set @g=1; select @g,(@g:=c),@g from t1; @g (@g:=c) @g 1 test 0 select @c, @d, @e, @f; @c @d @e @f 1 1 2 test select @d:=id, @e:=id, @f:=id, @g:=@id from t1; @d:=id @e:=id @f:=id @g:=@id 1 1 1 NULL select @c, @d, @e, @f, @g; @c @d @e @f @g 1 1 1 1 NULL drop table t1; select @a:=10, @b:=2, @a>@b, @a:="10", @b:="2", @a>@b, @a:=10, @b:=2, @a>@b, @a:="10", @b:="2", @a>@b; @a:=10 @b:=2 @a>@b @a:="10" @b:="2" @a>@b @a:=10 @b:=2 @a>@b @a:="10" @b:="2" @a>@b 10 2 1 10 2 1 10 2 1 10 2 1 create table t1 (i int not null); insert t1 values (1),(2),(2),(3),(3),(3); select @a:=0; @a:=0 0 select @a, @a:=@a+count(*), count(*), @a from t1 group by i; @a @a:=@a+count(*) count(*) @a 0 1 1 0 0 2 2 0 0 3 3 0 select @a:=0; @a:=0 0 select @a+0, @a:=@a+0+count(*), count(*), @a+0 from t1 group by i; @a+0 @a:=@a+0+count(*) count(*) @a+0 0 1 1 0 0 2 2 0 0 3 3 0 set @a=0; select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i; @a @a:="hello" @a @a:=3 @a @a:="hello again" 0 hello 0 3 0 hello again 0 hello 0 3 0 hello again 0 hello 0 3 0 hello again select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i; @a @a:="hello" @a @a:=3 @a @a:="hello again" hello again hello hello again 3 hello again hello again hello again hello hello again 3 hello again hello again hello again hello hello again 3 hello again hello again drop table t1; set @a=_latin2'test'; select charset(@a),collation(@a),coercibility(@a); charset(@a) collation(@a) coercibility(@a) latin2 latin2_general_ci 2 select @a=_latin2'TEST'; @a=_latin2'TEST' 1 select @a=_latin2'TEST' collate latin2_bin; @a=_latin2'TEST' collate latin2_bin 0 set @a=_latin2'test' collate latin2_general_ci; select charset(@a),collation(@a),coercibility(@a); charset(@a) collation(@a) coercibility(@a) latin2 latin2_general_ci 2 select @a=_latin2'TEST'; @a=_latin2'TEST' 1 select @a=_latin2'TEST' collate latin2_bin; @a=_latin2'TEST' collate latin2_bin 0 select charset(@a:=_latin2'test'); charset(@a:=_latin2'test') latin2 select collation(@a:=_latin2'test'); collation(@a:=_latin2'test') latin2_general_ci select coercibility(@a:=_latin2'test'); coercibility(@a:=_latin2'test') 2 select collation(@a:=_latin2'test' collate latin2_bin); collation(@a:=_latin2'test' collate latin2_bin) latin2_bin select coercibility(@a:=_latin2'test' collate latin2_bin); coercibility(@a:=_latin2'test' collate latin2_bin) 2 select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST'; (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' 0 select charset(@a),collation(@a),coercibility(@a); charset(@a) collation(@a) coercibility(@a) latin2 latin2_bin 2 select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci; (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci 1 set @var= NULL ; select FIELD( @var,'1it','Hit') as my_column; my_column 0 select @v, coercibility(@v); @v coercibility(@v) NULL 2 set @v1=null, @v2=1, @v3=1.1, @v4=now(); select coercibility(@v1),coercibility(@v2),coercibility(@v3),coercibility(@v4); coercibility(@v1) coercibility(@v2) coercibility(@v3) coercibility(@v4) 2 2 2 2 set session @honk=99; 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 '@honk=99' at line 1 select @@local.max_allowed_packet; @@local.max_allowed_packet # select @@session.max_allowed_packet; @@session.max_allowed_packet # select @@global.max_allowed_packet; @@global.max_allowed_packet # select @@max_allowed_packet; @@max_allowed_packet # select @@Max_Allowed_Packet; @@Max_Allowed_Packet # select @@version; @@version # select @@global.version; @@global.version # End of 4.1 tests set @first_var= NULL; create table t1 select @first_var; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `@first_var` longblob ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; set @first_var= cast(NULL as signed integer); create table t1 select @first_var; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `@first_var` bigint(20) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; set @first_var= NULL; create table t1 select @first_var; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `@first_var` bigint(20) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; set @first_var= concat(NULL); create table t1 select @first_var; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `@first_var` longblob ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; set @first_var=1; set @first_var= cast(NULL as CHAR); create table t1 select @first_var; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `@first_var` longtext ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; set @a=18446744071710965857; select @a; @a 18446744071710965857 CREATE TABLE `bigfailure` ( `afield` BIGINT UNSIGNED NOT NULL ); INSERT INTO `bigfailure` VALUES (18446744071710965857); SELECT * FROM bigfailure; afield 18446744071710965857 select * from (SELECT afield FROM bigfailure) as b; afield 18446744071710965857 select * from bigfailure where afield = (SELECT afield FROM bigfailure); afield 18446744071710965857 select * from bigfailure where afield = 18446744071710965857; afield 18446744071710965857 select * from bigfailure where afield = 18446744071710965856+1; afield 18446744071710965857 SET @a := (SELECT afield FROM bigfailure); SELECT @a; @a 18446744071710965857 SET @a := (select afield from (SELECT afield FROM bigfailure) as b); SELECT @a; @a 18446744071710965857 SET @a := (select * from bigfailure where afield = (SELECT afield FROM bigfailure)); SELECT @a; @a 18446744071710965857 drop table bigfailure; create table t1(f1 int, f2 int); insert into t1 values (1,2),(2,3),(3,1); select @var:=f2 from t1 group by f1 order by f2 desc limit 1; @var:=f2 3 select @var; @var 3 create table t2 as select @var:=f2 from t1 group by f1 order by f2 desc limit 1; select * from t2; @var:=f2 3 select @var; @var 3 drop table t1,t2; insert into city 'blah'; 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 ''blah'' at line 1 SHOW COUNT(*) WARNINGS; @@session.warning_count 1 SHOW COUNT(*) ERRORS; @@session.error_count 1 create table t1(f1 int, f2 varchar(2), f3 float, f4 decimal(2,1)); insert into t1 values (1, "a", 1.5, 1.6), (1, "a", 1.5, 1.6), (2, "b", 2.5, 2.6), (3, "c", 3.5, 3.6), (4, "d", 4.5, 4.6), (1, "a", 1.5, 1.6), (3, "c", 3.5, 3.6), (1, "a", 1.5, 1.6); select @a:=f1, count(f1) from t1 group by 1 desc; @a:=f1 count(f1) 4 1 3 2 2 1 1 4 select @a:=f1, count(f1) from t1 group by 1 asc; @a:=f1 count(f1) 1 4 2 1 3 2 4 1 select @a:=f2, count(f2) from t1 group by 1 desc; @a:=f2 count(f2) d 1 c 2 b 1 a 4 select @a:=f3, count(f3) from t1 group by 1 desc; @a:=f3 count(f3) 4.5 1 3.5 2 2.5 1 1.5 4 select @a:=f4, count(f4) from t1 group by 1 desc; @a:=f4 count(f4) 4.6 1 3.6 2 2.6 1 1.6 4 drop table t1; create table t1 (f1 int); insert into t1 values (2), (1); select @i := f1 as j from t1 order by 1; j 1 2 drop table t1; create table t1(a int); insert into t1 values(5),(4),(4),(3),(2),(2),(2),(1); set @rownum := 0; set @rank := 0; set @prev_score := NULL; select @rownum := @rownum + 1 as row, @rank := IF(@prev_score!=a, @rownum, @rank) as rank, @prev_score := a as score from t1 order by score desc; drop table t1; create table t1(b bigint); insert into t1 (b) values (10), (30), (10); set @var := 0; select if(b=@var, 999, b) , @var := b from t1 order by b; if(b=@var, 999, b) @var := b 10 10 999 10 30 30 drop table t1; create temporary table t1 (id int); insert into t1 values (2), (3), (3), (4); set @lastid=-1; select @lastid != id, @lastid, @lastid := id from t1; @lastid != id @lastid @lastid := id 1 -1 2 1 2 3 0 3 3 1 3 4 drop table t1; create temporary table t1 (id bigint); insert into t1 values (2), (3), (3), (4); set @lastid=-1; select @lastid != id, @lastid, @lastid := id from t1; @lastid != id @lastid @lastid := id 1 -1 2 1 2 3 0 3 3 1 3 4 drop table t1; CREATE TABLE t1(a INT, b INT); INSERT INTO t1 VALUES (0, 0), (2, 1), (2, 3), (1, 1), (30, 20); SELECT a, b INTO @a, @b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b; SELECT @a, @b; @a @b 2 3 SELECT a, b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b; a b 2 3 DROP TABLE t1; CREATE TABLE t1 (f1 int(11) default NULL, f2 int(11) default NULL); CREATE TABLE t2 (f1 int(11) default NULL, f2 int(11) default NULL, foo int(11)); CREATE TABLE t3 (f1 int(11) default NULL, f2 int(11) default NULL); INSERT INTO t1 VALUES(10, 10); INSERT INTO t1 VALUES(10, 10); INSERT INTO t2 VALUES(10, 10, 10); INSERT INTO t2 VALUES(10, 10, 10); INSERT INTO t3 VALUES(10, 10); INSERT INTO t3 VALUES(10, 10); SELECT MIN(t2.f1), @bar:= (SELECT MIN(t3.f2) FROM t3 WHERE t3.f2 > foo) FROM t1,t2 WHERE t1.f1 = t2.f1 ORDER BY t2.f1; MIN(t2.f1) @bar:= (SELECT MIN(t3.f2) FROM t3 WHERE t3.f2 > foo) 10 NULL DROP TABLE t1, t2, t3; End of 5.0 tests CREATE TABLE t1 (i INT); CREATE TRIGGER t_after_insert AFTER INSERT ON t1 FOR EACH ROW SET @bug42188 = 10; INSERT INTO t1 VALUES (1); INSERT INTO t1 VALUES (1); DROP TABLE t1; CREATE TABLE t1(a INT); INSERT INTO t1 VALUES (0),(0); # BUG#55615 : should not crash SELECT (@a:=(SELECT @a:=1 FROM t1 LIMIT 1)) AND COUNT(1) FROM t1 GROUP BY @a; (@a:=(SELECT @a:=1 FROM t1 LIMIT 1)) AND COUNT(1) 1 1 # BUG#55564 : should not crash SELECT IF( @v:=LEAST((SELECT 1 FROM t1 t2 LEFT JOIN t1 ON (@v) GROUP BY t1.a), a), count(*), 1) FROM t1 GROUP BY a LIMIT 1; IF( @v:=LEAST((SELECT 1 FROM t1 t2 LEFT JOIN t1 ON (@v) GROUP BY t1.a), a), count(*), 1) 1 DROP TABLE t1; select @v:=@v:=sum(1) from dual; @v:=@v:=sum(1) 1 CREATE TABLE t1(a DECIMAL(31,21)); INSERT INTO t1 VALUES (0); SELECT (@v:=a) <> (@v:=1) FROM t1; (@v:=a) <> (@v:=1) 1 DROP TABLE t1; End of 5.1 tests DROP TABLE IF EXISTS t1; CREATE TABLE t1(f1 INT AUTO_INCREMENT, PRIMARY KEY(f1)); INSERT INTO t1 SET f1 = NULL ; SET @aux = NULL ; INSERT INTO t1 SET f1 = @aux ; SET @aux1 = 0.123E-1; SET @aux1 = NULL; INSERT INTO t1 SET f1 = @aux1 ; SELECT * FROM t1; f1 1 2 3 DROP TABLE t1; CREATE TABLE t1(f1 VARCHAR(257) , f2 INT, PRIMARY KEY(f2)); CREATE TRIGGER trg1 BEFORE INSERT ON t1 FOR EACH ROW SET @aux = 1; SET @aux = 1; SET @aux = NULL; INSERT INTO test.t1 (f1, f2) VALUES (1, 1), (@aux, 2); SET @aux = 'text'; SET @aux = NULL; INSERT INTO t1(f1, f2) VALUES (1, 3), (@aux, 4); SELECT f1, f2 FROM t1 ORDER BY f2; f1 f2 1 1 1 2 1 3 1 4 DROP TRIGGER trg1; DROP TABLE t1; # # Bug #12408412: GROUP_CONCAT + ORDER BY + INPUT/OUTPUT # SAME USER VARIABLE = CRASH # SET @bug12408412=1; SELECT GROUP_CONCAT(@bug12408412 ORDER BY 1) INTO @bug12408412; End of 5.5 tests CREATE TABLE t1(a int); INSERT INTO t1 VALUES (1), (2); SELECT DISTINCT @a:=MIN(t1.a) FROM t1, t1 AS t2 GROUP BY @b:=(SELECT COUNT(*) > t2.a); @a:=MIN(t1.a) 1 DROP TABLE t1; CREATE TABLE t1(a INT) ENGINE=InnoDB; INSERT INTO t1 VALUES (0); SELECT DISTINCT POW(COUNT(*), @a:=(SELECT 1 FROM t1 LEFT JOIN t1 AS t2 ON @a)) AS b FROM t1 GROUP BY a; b 1 SELECT @a; @a 1 DROP TABLE t1; CREATE TABLE t1(f1 INT, f2 INT); INSERT INTO t1 VALUES (1,2),(2,3),(3,1); CREATE TABLE t2(a INT); INSERT INTO t2 VALUES (1); SET @var=NULL; SELECT @var:=(SELECT f2 FROM t2 WHERE @var) FROM t1 GROUP BY f1 ORDER BY f2 DESC LIMIT 1; @var:=(SELECT f2 FROM t2 WHERE @var) NULL SELECT @var; @var NULL DROP TABLE t1, t2; CREATE TABLE t1(a INT); INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10); CREATE TABLE t2(a INT); INSERT INTO t2 VALUES (1), (3), (5), (7), (9); CREATE TABLE t3(a INT); INSERT INTO t3 VALUES (1), (4), (7), (10); SET @var1 = 6; explain format=json SELECT t1.a, t2.a, t3.a, (@var1:= @var1+0) AS var FROM t1 LEFT JOIN t2 ON t1.a=t2.a AND t2.a < @var1 LEFT JOIN t3 ON t1.a=t3.a AND t3.a < @var1; EXPLAIN { "query_block": { "select_id": 1, "nested_loop": [ { "table": { "table_name": "t1", "access_type": "ALL", "rows": 10, "filtered": 100 } }, { "table": { "table_name": "t2", "access_type": "ALL", "rows": 5, "filtered": 100, "using_join_buffer": "Block Nested Loop", "attached_condition": "<if>(is_not_null_compl(t2), ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t2`.`a` < (@`var1`))), true)" } }, { "table": { "table_name": "t3", "access_type": "ALL", "rows": 4, "filtered": 100, "using_join_buffer": "Block Nested Loop", "attached_condition": "<if>(is_not_null_compl(t3), ((`test`.`t1`.`a` = `test`.`t3`.`a`) and (`test`.`t3`.`a` < (@`var1`))), true)" } } ] } } Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,`test`.`t3`.`a` AS `a`,(@var1:=((@`var1`) + 0)) AS `var` from `test`.`t1` left join `test`.`t2` on(((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t2`.`a` < (@`var1`)))) left join `test`.`t3` on(((`test`.`t1`.`a` = `test`.`t3`.`a`) and (`test`.`t3`.`a` < (@`var1`)))) where 1 SELECT t1.a, t2.a, t3.a, (@var1:= @var1+0) AS var FROM t1 LEFT JOIN t2 ON t1.a=t2.a AND t2.a < @var1 LEFT JOIN t3 ON t1.a=t3.a AND t3.a < @var1; a a a var 1 1 1 6 10 NULL NULL 6 2 NULL NULL 6 3 3 NULL 6 4 NULL 4 6 5 5 NULL 6 6 NULL NULL 6 7 NULL NULL 6 8 NULL NULL 6 9 NULL NULL 6 DROP TABLE t1, t2, t3;