mirror of
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be093c81a7
The ROWNUM() function is for SELECT mapped to JOIN->accepted_rows, which is
incremented for each accepted rows.
For Filesort, update, insert, delete and load data, we map ROWNUM() to
internal variables incremented when the table is changed.
The connection between the row counter and Item_func_rownum is done
in sql_select.cc::fix_items_after_optimize() and
sql_insert.cc::fix_rownum_pointers()
When ROWNUM() is used anywhere in query, the optimization to ignore ORDER
BY in sub queries are disabled. This was done to get the following common
Oracle query to work:
select * from (select * from t1 order by a desc) as t where rownum() <= 2;
MDEV-3926 "Wrong result with GROUP BY ... WITH ROLLUP" contains a discussion
about this topic.
LIMIT optimization is enabled when in a top level WHERE clause comparing
ROWNUM() with a numerical constant using any of the following expressions:
- ROWNUM() < #
- ROWNUM() <= #
- ROWNUM() = 1
ROWNUM() can be also be the right argument to the comparison function.
LIMIT optimization is done in two cases:
- For the current sub query when the ROWNUM comparison is done on the top
level:
SELECT * from t1 WHERE rownum() <= 2 AND t1.a > 0
- For an inner sub query, when the upper level has only a ROWNUM comparison
in the WHERE clause:
SELECT * from (select * from t1) as t WHERE rownum() <= 2
In Oracle mode, one can also use ROWNUM without parentheses.
Other things:
- Fixed bug where the optimizer tries to optimize away sub queries
with RAND_TABLE_BIT set (non-deterministic queries). Now these
sub queries will not be converted to joins. This bug fix was also
needed to get rownum() working inside subqueries.
- In remove_const() remove setting simple_order to FALSE if ROLLUP is
USED. This code was disable a long time ago because of wrong assignment
in the following code. Instead we set simple_order to false if
RAND_TABLE_BIT was used in the SELECT list. This ensures that
we don't delete ORDER BY if the result set is not deterministic, like
in 'SELECT RAND() AS 'r' FROM t1 ORDER BY r';
- Updated parameters for Sort_param::init_for_filesort() to be able
to provide filesort with information where the number of accepted
rows should be stored
- Reordered fields in class Filesort to optimize storage layout
- Added new error messsage to tell that a function can't be used in HAVING
- Added field 'with_rownum' to THD to mark that ROWNUM() is used in the
query.
Co-author: Oleksandr Byelkin <sanja@mariadb.com>
LIMIT optimization for sub query
598 lines
15 KiB
Text
598 lines
15 KiB
Text
set @a := foo;
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ERROR 42S22: Unknown column 'foo' in 'field list'
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set @a := connection_id() + 3;
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select @a - connection_id();
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@a - connection_id()
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3
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set @b := 1;
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select @b;
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@b
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1
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CREATE TABLE t1 ( i int not null, v int not null,index (i));
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insert into t1 values (1,1),(1,3),(2,1);
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create table t2 (i int not null, unique (i));
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insert into t2 select distinct i from t1;
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select * from t2;
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i
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1
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2
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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;
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i @vv1:=if(sv1.i,1,0) @vv2:=if(sv2.i,1,0) @vv3:=if(sv3.i,1,0) @vv1+@vv2+@vv3
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1 1 0 1 2
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2 1 0 0 1
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explain select * from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref i i 4 const 2
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select @vv1,i,v from t1 where i=@vv1;
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@vv1 i v
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1 1 1
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1 1 3
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explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
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explain select @vv1:=i from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL i 4 NULL 3 Using where; Using index
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explain select * from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref i i 4 const 2
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drop table t1,t2;
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set @a=0,@b=0;
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select @a:=10, @b:=1, @a > @b, @a < @b;
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@a:=10 @b:=1 @a > @b @a < @b
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10 1 1 0
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select @a:="10", @b:="1", @a > @b, @a < @b;
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@a:="10" @b:="1" @a > @b @a < @b
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10 1 1 0
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select @a:=10, @b:=2, @a > @b, @a < @b;
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@a:=10 @b:=2 @a > @b @a < @b
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10 2 0 1
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select @a:="10", @b:="2", @a > @b, @a < @b;
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@a:="10" @b:="2" @a > @b @a < @b
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10 2 1 0
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select @a:=1;
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@a:=1
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1
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select @a, @a:=1;
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@a @a:=1
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1 1
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create table t1 (id int, d double, c char(10));
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insert into t1 values (1,2.0, "test");
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select @c:=0;
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@c:=0
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0
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update t1 SET id=(@c:=@c+1);
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select @c;
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@c
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1
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select @c:=0;
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@c:=0
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0
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update t1 set id=(@c:=@c+1);
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select @c;
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@c
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1
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select @c:=0;
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@c:=0
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0
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select @c:=@c+1;
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@c:=@c+1
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1
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select @d,(@d:=id),@d from t1;
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@d (@d:=id) @d
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NULL 1 1
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select @e,(@e:=d),@e from t1;
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@e (@e:=d) @e
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NULL 2 2
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select @f,(@f:=c),@f from t1;
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@f (@f:=c) @f
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NULL test test
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set @g=1;
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select @g,(@g:=c),@g from t1;
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@g (@g:=c) @g
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1 test 0
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select @c, @d, @e, @f;
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@c @d @e @f
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1 1 2 test
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select @d:=id, @e:=id, @f:=id, @g:=@id from t1;
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@d:=id @e:=id @f:=id @g:=@id
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1 1 1 NULL
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select @c, @d, @e, @f, @g;
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@c @d @e @f @g
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1 1 1 1 NULL
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drop table t1;
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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;
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@a:=10 @b:=2 @a>@b @a:="10" @b:="2" @a>@b @a:=10 @b:=2 @a>@b @a:="10" @b:="2" @a>@b
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10 2 1 10 2 1 10 2 1 10 2 1
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create table t1 (i int not null);
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insert t1 values (1),(2),(2),(3),(3),(3);
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select @a:=0;
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@a:=0
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0
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select @a, @a:=@a+count(*), count(*), @a from t1 group by i;
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@a @a:=@a+count(*) count(*) @a
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0 1 1 0
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0 2 2 0
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0 3 3 0
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select @a:=0;
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@a:=0
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0
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select @a+0, @a:=@a+0+count(*), count(*), @a+0 from t1 group by i;
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@a+0 @a:=@a+0+count(*) count(*) @a+0
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0 1 1 0
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0 2 2 0
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0 3 3 0
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set @a=0;
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select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
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@a @a:="hello" @a @a:=3 @a @a:="hello again"
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0 hello 0 3 0 hello again
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0 hello 0 3 0 hello again
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0 hello 0 3 0 hello again
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select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
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@a @a:="hello" @a @a:=3 @a @a:="hello again"
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hello again hello hello again 3 hello again hello again
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hello again hello hello again 3 hello again hello again
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hello again hello hello again 3 hello again hello again
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drop table t1;
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set @a=_latin2'test';
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select charset(@a),collation(@a),coercibility(@a);
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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_general_ci 2
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select @a=_latin2'TEST';
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@a=_latin2'TEST'
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1
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select @a=_latin2'TEST' collate latin2_bin;
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@a=_latin2'TEST' collate latin2_bin
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0
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set @a=_latin2'test' collate latin2_general_ci;
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select charset(@a),collation(@a),coercibility(@a);
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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_general_ci 2
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select @a=_latin2'TEST';
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@a=_latin2'TEST'
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1
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select @a=_latin2'TEST' collate latin2_bin;
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@a=_latin2'TEST' collate latin2_bin
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0
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select charset(@a:=_latin2'test');
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charset(@a:=_latin2'test')
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latin2
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select collation(@a:=_latin2'test');
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collation(@a:=_latin2'test')
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latin2_general_ci
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select coercibility(@a:=_latin2'test');
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coercibility(@a:=_latin2'test')
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2
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select collation(@a:=_latin2'test' collate latin2_bin);
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collation(@a:=_latin2'test' collate latin2_bin)
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latin2_bin
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select coercibility(@a:=_latin2'test' collate latin2_bin);
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coercibility(@a:=_latin2'test' collate latin2_bin)
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2
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select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST';
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(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST'
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0
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select charset(@a),collation(@a),coercibility(@a);
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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_bin 2
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select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
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(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci
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1
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set @var= NULL ;
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select FIELD( @var,'1it','Hit') as my_column;
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my_column
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0
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select @v, coercibility(@v);
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@v coercibility(@v)
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NULL 2
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set @v1=null, @v2=1, @v3=1.1, @v4=now();
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select coercibility(@v1),coercibility(@v2),coercibility(@v3),coercibility(@v4);
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coercibility(@v1) coercibility(@v2) coercibility(@v3) coercibility(@v4)
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2 5 5 2
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set session @honk=99;
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '@honk=99' at line 1
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select @@local.max_allowed_packet;
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@@local.max_allowed_packet
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#
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select @@session.max_allowed_packet;
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@@session.max_allowed_packet
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#
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select @@global.max_allowed_packet;
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@@global.max_allowed_packet
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#
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select @@max_allowed_packet;
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@@max_allowed_packet
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#
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select @@Max_Allowed_Packet;
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@@Max_Allowed_Packet
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#
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select @@version;
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@@version
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#
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select @@global.version;
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@@global.version
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#
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End of 4.1 tests
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set @first_var= NULL;
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create table t1 select @first_var;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` longblob DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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drop table t1;
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set @first_var= cast(NULL as signed integer);
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create table t1 select @first_var;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` bigint(20) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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drop table t1;
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set @first_var= NULL;
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create table t1 select @first_var;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` bigint(20) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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drop table t1;
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set @first_var= concat(NULL);
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create table t1 select @first_var;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` longblob DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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drop table t1;
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set @first_var=1;
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set @first_var= cast(NULL as CHAR);
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create table t1 select @first_var;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` longtext DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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drop table t1;
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set @a=18446744071710965857;
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select @a;
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@a
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18446744071710965857
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CREATE TABLE `bigfailure` (
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`afield` BIGINT UNSIGNED NOT NULL
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);
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INSERT INTO `bigfailure` VALUES (18446744071710965857);
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SELECT * FROM bigfailure;
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afield
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18446744071710965857
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select * from (SELECT afield FROM bigfailure) as b;
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afield
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18446744071710965857
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select * from bigfailure where afield = (SELECT afield FROM bigfailure);
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afield
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18446744071710965857
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select * from bigfailure where afield = 18446744071710965857;
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afield
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18446744071710965857
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select * from bigfailure where afield = 18446744071710965856+1;
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afield
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18446744071710965857
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SET @a := (SELECT afield FROM bigfailure);
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SELECT @a;
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@a
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18446744071710965857
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SET @a := (select afield from (SELECT afield FROM bigfailure) as b);
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SELECT @a;
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@a
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18446744071710965857
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SET @a := (select * from bigfailure where afield = (SELECT afield FROM bigfailure));
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SELECT @a;
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@a
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18446744071710965857
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drop table bigfailure;
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create table t1(f1 int, f2 int);
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insert into t1 values (1,2),(2,3),(3,1);
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select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
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@var:=f2
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3
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select @var;
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@var
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3
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create table t2 as select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
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select * from t2;
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@var:=f2
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3
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select @var;
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@var
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3
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drop table t1,t2;
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insert into city 'blah';
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ''blah'' at line 1
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SHOW COUNT(*) WARNINGS;
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@@session.warning_count
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1
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SHOW COUNT(*) ERRORS;
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@@session.error_count
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1
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create table t1(f1 int, f2 varchar(2), f3 float, f4 decimal(2,1));
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insert into t1 values
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(1, "a", 1.5, 1.6), (1, "a", 1.5, 1.6), (2, "b", 2.5, 2.6),
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(3, "c", 3.5, 3.6), (4, "d", 4.5, 4.6), (1, "a", 1.5, 1.6),
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(3, "c", 3.5, 3.6), (1, "a", 1.5, 1.6);
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select @a:=f1, count(f1) from t1 group by 1 desc;
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@a:=f1 count(f1)
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4 1
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3 2
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2 1
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1 4
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select @a:=f1, count(f1) from t1 group by 1 asc;
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@a:=f1 count(f1)
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1 4
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2 1
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3 2
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4 1
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select @a:=f2, count(f2) from t1 group by 1 desc;
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@a:=f2 count(f2)
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d 1
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c 2
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b 1
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a 4
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select @a:=f3, count(f3) from t1 group by 1 desc;
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@a:=f3 count(f3)
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4.5 1
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3.5 2
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2.5 1
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1.5 4
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select @a:=f4, count(f4) from t1 group by 1 desc;
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@a:=f4 count(f4)
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4.6 1
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3.6 2
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2.6 1
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1.6 4
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drop table t1;
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create table t1 (f1 int);
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insert into t1 values (2), (1);
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select @i := f1 as j from t1 order by 1;
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j
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1
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2
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drop table t1;
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create table t1(a int);
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insert into t1 values(5),(4),(4),(3),(2),(2),(2),(1);
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set @rownum := 0;
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set @rank := 0;
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set @prev_score := NULL;
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select @rownum := @rownum + 1 as row,
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@rank := IF(@prev_score!=a, @rownum, @rank) as rank,
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@prev_score := a as score
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from t1 order by score desc;
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drop table t1;
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create table t1(b bigint);
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insert into t1 (b) values (10), (30), (10), (10);
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set @var := 0;
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explain select if(b=@var, 999, b) , @var := b from t1 order by b;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using temporary; Using filesort
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set @var := 0;
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select if(b=@var, 999, b) , @var := b from t1 order by b;
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if(b=@var, 999, b) @var := b
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10 10
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10 10
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30 30
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999 10
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drop table t1;
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create temporary table t1 (id int);
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insert into t1 values (2), (3), (3), (4);
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set @lastid=-1;
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select @lastid != id, @lastid, @lastid := id from t1;
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@lastid != id @lastid @lastid := id
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1 -1 2
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1 2 3
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0 3 3
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1 3 4
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drop table t1;
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create temporary table t1 (id bigint);
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insert into t1 values (2), (3), (3), (4);
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set @lastid=-1;
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select @lastid != id, @lastid, @lastid := id from t1;
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@lastid != id @lastid @lastid := id
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|
1 -1 2
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1 2 3
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0 3 3
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1 3 4
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|
drop table t1;
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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;
|
|
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;
|
|
SET @bug12408412=1;
|
|
SELECT GROUP_CONCAT(@bug12408412 ORDER BY 1) INTO @bug12408412;
|
|
End of 5.1 tests
|
|
CREATE TABLE t1(a INT);
|
|
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 (0),(1),(3);
|
|
SELECT DISTINCT POW(COUNT(distinct a), @a:=(SELECT 1 FROM t1 LEFT JOIN t1 AS t2 ON @a limit 1)) AS b FROM t1 GROUP BY a;
|
|
b
|
|
1
|
|
SELECT @a;
|
|
@a
|
|
1
|
|
DROP TABLE t1;
|
|
End of 5.2 tests
|
|
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;
|
|
CREATE TABLE t1(a INT);
|
|
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 (0),(1),(3);
|
|
SELECT DISTINCT POW(COUNT(distinct a), @a:=(SELECT 1 FROM t1 LEFT JOIN t1 AS t2 ON @a limit 1)) AS b FROM t1 GROUP BY a;
|
|
b
|
|
1
|
|
SELECT @a;
|
|
@a
|
|
1
|
|
DROP TABLE t1;
|
|
End of 5.5 tests
|
|
#
|
|
# Check that used memory extends if we set a variable
|
|
#
|
|
set @var= repeat('a',20000);
|
|
1
|
|
explain select @a:=max(seq) from seq_1_to_1000000;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
#
|
|
# Start of 10.3 tests
|
|
#
|
|
#
|
|
# MDEV-12859 Out-of-range error for CREATE..SELECT @a:=EXTRACT(MINUTE_MICROSECOND FROM..
|
|
#
|
|
SET sql_mode=STRICT_ALL_TABLES;
|
|
CREATE OR REPLACE TABLE t1 AS
|
|
SELECT @a:=EXTRACT(MINUTE_MICROSECOND FROM '2001-01-01 11:22:33.999999') AS c1;
|
|
SHOW CREATE TABLE t1;
|
|
Table Create Table
|
|
t1 CREATE TABLE `t1` (
|
|
`c1` bigint(11) DEFAULT NULL
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
|
SELECT * FROM t1;
|
|
c1
|
|
2233999999
|
|
DROP TABLE t1;
|
|
SET sql_mode=DEFAULT;
|