mariadb/mysql-test/r/user_var.result

set @a := foo;
Unknown column 'foo' in 'field list'
set @a := connection_id() + 3;
select @a - connection_id();
@a - connection_id()
3
drop table if exists t1,t2;
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;
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	i	i	4	const	1	Using where
explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ALL	NULL	NULL	NULL	NULL	3	Using where
explain select @vv1:=i from t1 where i=@vv1;
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	index	NULL	i	4	NULL	3	Using where; Using index
explain select * from t1 where i=@vv1;
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	i	i	4	const	1	Using where
drop table t1,t2;
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	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:=1;
@a:=1
1
select @a, @a:=1;
@a	@a:=1
1	1
create table t1 (id int);
insert into t1 values (1);
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
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	0	10	2	1	10	2	0