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Merge spetrunia@bk-internal.mysql.com:/home/bk/mysql-5.0-opt
into mysql.com:/home/psergey/mysql-5.0-bug8804-r4 sql/sql_lex.cc: Auto merged sql/sql_lex.h: Auto merged
This commit is contained in:
unknown
@ -744,7 +744,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1003 select `test`.`t2`.`id` AS `id` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`id`,<exists>(select 1 AS `1` having (<cache>(`test`.`t2`.`id`) = <ref_null_helper>(1)) union select 3 AS `3` having (<cache>(`test`.`t2`.`id`) = <ref_null_helper>(3))))
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||||
Note 1003 select `test`.`t2`.`id` AS `id` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`id`,<exists>(select 1 AS `1` having trigcond((<cache>(`test`.`t2`.`id`) = <ref_null_helper>(1))) union select 3 AS `3` having trigcond((<cache>(`test`.`t2`.`id`) = <ref_null_helper>(3)))))
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SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 3);
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id
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SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 2);
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@ -907,7 +907,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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||||
2 DEPENDENT SUBQUERY t2 ref_or_null a a 5 func 2 Using where; Using index
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2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 3 Using where
|
||||
Warnings:
|
||||
Note 1003 select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and ((<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`))) having <is_not_null_test>(`test`.`t2`.`a`))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
|
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Note 1003 select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and trigcond(((<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`)))) having trigcond(<is_not_null_test>(`test`.`t2`.`a`)))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
|
||||
drop table t1,t2,t3;
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create table t1 (a float);
|
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select 10.5 IN (SELECT * from t1 LIMIT 1);
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||||
@ -2817,19 +2817,19 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8
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2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 9 Using where
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Warnings:
|
||||
Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where ((`test`.`t2`.`flag` = _latin1'0') and ((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) or isnull(`test`.`t2`.`one`)) and ((<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`) or isnull(`test`.`t2`.`two`))) having (<is_not_null_test>(`test`.`t2`.`one`) and <is_not_null_test>(`test`.`t2`.`two`)))) AS `test` from `test`.`t1`
|
||||
Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where ((`test`.`t2`.`flag` = _latin1'0') and trigcond((((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) or isnull(`test`.`t2`.`one`)) and ((<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`) or isnull(`test`.`t2`.`two`))))) having trigcond((<is_not_null_test>(`test`.`t2`.`one`) and <is_not_null_test>(`test`.`t2`.`two`))))) AS `test` from `test`.`t1`
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explain extended SELECT one,two from t1 where ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = 'N');
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where
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2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 9 Using where
|
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Warnings:
|
||||
Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where ((`test`.`t2`.`flag` = _latin1'N') and (<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) and (<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`))))
|
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Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where ((`test`.`t2`.`flag` = _latin1'N') and trigcond(((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) and (<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`))))))
|
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explain extended SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = '0' group by one,two) as 'test' from t1;
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id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t1 ALL NULL NULL NULL NULL 8
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2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 9 Using where; Using temporary; Using filesort
|
||||
Warnings:
|
||||
Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where (`test`.`t2`.`flag` = _latin1'0') group by `test`.`t2`.`one`,`test`.`t2`.`two` having (((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) or isnull(`test`.`t2`.`one`)) and ((<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`) or isnull(`test`.`t2`.`two`)) and <is_not_null_test>(`test`.`t2`.`one`) and <is_not_null_test>(`test`.`t2`.`two`)))) AS `test` from `test`.`t1`
|
||||
Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where (`test`.`t2`.`flag` = _latin1'0') group by `test`.`t2`.`one`,`test`.`t2`.`two` having trigcond((((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) or isnull(`test`.`t2`.`one`)) and ((<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`) or isnull(`test`.`t2`.`two`)) and <is_not_null_test>(`test`.`t2`.`one`) and <is_not_null_test>(`test`.`t2`.`two`))))) AS `test` from `test`.`t1`
|
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DROP TABLE t1,t2;
|
||||
CREATE TABLE t1 (a char(5), b char(5));
|
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INSERT INTO t1 VALUES (NULL,'aaa'), ('aaa','aaa');
|
||||
|
||||
153
mysql-test/r/subselect3.result
Normal file
153
mysql-test/r/subselect3.result
Normal file
@ -0,0 +1,153 @@
|
||||
drop table if exists t0, t1, t2, t3, t4;
|
||||
create table t1 (oref int, grp int, ie int) ;
|
||||
insert into t1 (oref, grp, ie) values
|
||||
(1, 1, 1),
|
||||
(1, 1, 1),
|
||||
(1, 2, NULL),
|
||||
(2, 1, 3),
|
||||
(3, 1, 4),
|
||||
(3, 2, NULL);
|
||||
create table t2 (oref int, a int);
|
||||
insert into t2 values
|
||||
(1, 1),
|
||||
(2, 2),
|
||||
(3, 3),
|
||||
(4, NULL),
|
||||
(2, NULL);
|
||||
select a, oref, a in (select max(ie)
|
||||
from t1 where oref=t2.oref group by grp) from t2;
|
||||
a oref a in (select max(ie)
|
||||
from t1 where oref=t2.oref group by grp)
|
||||
1 1 1
|
||||
2 2 0
|
||||
3 3 NULL
|
||||
NULL 4 0
|
||||
NULL 2 NULL
|
||||
explain extended
|
||||
select a, oref, a in (select max(ie)
|
||||
from t1 where oref=t2.oref group by grp) from t2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t2 ALL NULL NULL NULL NULL 5
|
||||
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 Using where; Using temporary; Using filesort
|
||||
Warnings:
|
||||
Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
|
||||
Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>(`test`.`t2`.`a`,<exists>(select max(`test`.`t1`.`ie`) AS `max(ie)` from `test`.`t1` where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) group by `test`.`t1`.`grp` having trigcond((<cache>(`test`.`t2`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`)))))) AS `a in (select max(ie)
|
||||
from t1 where oref=t2.oref group by grp)` from `test`.`t2`
|
||||
explain extended
|
||||
select a, oref from t2
|
||||
where a in (select max(ie) from t1 where oref=t2.oref group by grp);
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
|
||||
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 Using where; Using temporary; Using filesort
|
||||
Warnings:
|
||||
Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
|
||||
Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,<exists>(select max(`test`.`t1`.`ie`) AS `max(ie)` from `test`.`t1` where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) group by `test`.`t1`.`grp` having (<cache>(`test`.`t2`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`)))))
|
||||
create table t3 (a int);
|
||||
insert into t3 values (NULL), (NULL);
|
||||
flush status;
|
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select a in (select max(ie) from t1 where oref=4 group by grp) from t3;
|
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a in (select max(ie) from t1 where oref=4 group by grp)
|
||||
0
|
||||
0
|
||||
show status like 'Handler_read_rnd_next';
|
||||
Variable_name Value
|
||||
Handler_read_rnd_next 11
|
||||
select ' ^ This must show 11' Z;
|
||||
Z
|
||||
^ This must show 11
|
||||
explain extended select a in (select max(ie) from t1 where oref=4 group by grp) from t3;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t3 ALL NULL NULL NULL NULL 2
|
||||
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 Using where; Using temporary; Using filesort
|
||||
Warnings:
|
||||
Note 1003 select <in_optimizer>(`test`.`t3`.`a`,<exists>(select max(`test`.`t1`.`ie`) AS `max(ie)` from `test`.`t1` where (`test`.`t1`.`oref` = 4) group by `test`.`t1`.`grp` having trigcond((<cache>(`test`.`t3`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`)))))) AS `a in (select max(ie) from t1 where oref=4 group by grp)` from `test`.`t3`
|
||||
drop table t1, t2, t3;
|
||||
create table t1 (a int, oref int, key(a));
|
||||
insert into t1 values
|
||||
(1, 1),
|
||||
(1, NULL),
|
||||
(2, 3),
|
||||
(2, NULL),
|
||||
(3, NULL);
|
||||
create table t2 (a int, oref int);
|
||||
insert into t2 values (1, 1), (2,2), (NULL, 3), (NULL, 4);
|
||||
select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
|
||||
oref a Z
|
||||
1 1 1
|
||||
2 2 0
|
||||
3 NULL NULL
|
||||
4 NULL 0
|
||||
explain extended
|
||||
select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t2 ALL NULL NULL NULL NULL 4
|
||||
2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 Using index; Using where
|
||||
Warnings:
|
||||
Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
|
||||
Note 1003 select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,<in_optimizer>(`test`.`t2`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on a checking NULL where (`test`.`t1`.`oref` = `test`.`t2`.`oref`)))) AS `Z` from `test`.`t2`
|
||||
flush status;
|
||||
select oref, a from t2 where a in (select a from t1 where oref=t2.oref);
|
||||
oref a
|
||||
1 1
|
||||
show status like '%Handler_read_rnd_next';
|
||||
Variable_name Value
|
||||
Handler_read_rnd_next 5
|
||||
delete from t2;
|
||||
insert into t2 values (NULL, 0),(NULL, 0), (NULL, 0), (NULL, 0);
|
||||
flush status;
|
||||
select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
|
||||
oref a Z
|
||||
0 NULL 0
|
||||
0 NULL 0
|
||||
0 NULL 0
|
||||
0 NULL 0
|
||||
show status like '%Handler_read%';
|
||||
Variable_name Value
|
||||
Handler_read_first 0
|
||||
Handler_read_key 0
|
||||
Handler_read_next 0
|
||||
Handler_read_prev 0
|
||||
Handler_read_rnd 0
|
||||
Handler_read_rnd_next 29
|
||||
select 'No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1.' Z;
|
||||
Z
|
||||
No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1.
|
||||
drop table t1, t2;
|
||||
create table t1 (a int, b int, primary key (a));
|
||||
insert into t1 values (1,1), (3,1),(100,1);
|
||||
create table t2 (a int, b int);
|
||||
insert into t2 values (1,1),(2,1),(NULL,1),(NULL,0);
|
||||
select a,b, a in (select a from t1 where t1.b = t2.b) Z from t2 ;
|
||||
a b Z
|
||||
1 1 1
|
||||
2 1 0
|
||||
NULL 1 NULL
|
||||
NULL 0 0
|
||||
drop table t1, t2;
|
||||
create table t1 (a int, b int, key(a));
|
||||
insert into t1 values
|
||||
(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
|
||||
create table t2 like t1;
|
||||
insert into t2 select * from t1;
|
||||
update t2 set b=1;
|
||||
create table t3 (a int, oref int);
|
||||
insert into t3 values (1, 1), (NULL,1), (NULL,0);
|
||||
select a, oref,
|
||||
t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z
|
||||
from t3;
|
||||
a oref Z
|
||||
1 1 1
|
||||
NULL 1 NULL
|
||||
NULL 0 0
|
||||
explain extended
|
||||
select a, oref,
|
||||
t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z
|
||||
from t3;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t3 ALL NULL NULL NULL NULL 3
|
||||
2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 4 Using where
|
||||
2 DEPENDENT SUBQUERY t2 ref a a 5 test.t1.b 1 Using where
|
||||
Warnings:
|
||||
Note 1276 Field or reference 't3.oref' of SELECT #2 was resolved in SELECT #1
|
||||
Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<in_optimizer>(`test`.`t3`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and trigcond(((<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`)))) having trigcond(<is_not_null_test>(`test`.`t1`.`a`)))) AS `Z` from `test`.`t3`
|
||||
drop table t1, t2, t3;
|
||||
137
mysql-test/t/subselect3.test
Normal file
137
mysql-test/t/subselect3.test
Normal file
@ -0,0 +1,137 @@
|
||||
--disable_warnings
|
||||
drop table if exists t0, t1, t2, t3, t4;
|
||||
--enable_warnings
|
||||
|
||||
#
|
||||
# 1. Subquery with GROUP/HAVING
|
||||
#
|
||||
create table t1 (oref int, grp int, ie int) ;
|
||||
insert into t1 (oref, grp, ie) values
|
||||
(1, 1, 1),
|
||||
(1, 1, 1),
|
||||
(1, 2, NULL),
|
||||
|
||||
(2, 1, 3),
|
||||
|
||||
(3, 1, 4),
|
||||
(3, 2, NULL);
|
||||
|
||||
# Ok, for
|
||||
# select max(ie) from t1 where oref=PARAM group by grp
|
||||
# we'll have:
|
||||
# 1 -> (1, NULL) matching + NULL
|
||||
# 2 -> (3) non-matching
|
||||
# 3 -> (3, NULL) non-matching + NULL
|
||||
# 4 -> () nothing.
|
||||
|
||||
create table t2 (oref int, a int);
|
||||
insert into t2 values
|
||||
(1, 1),
|
||||
(2, 2),
|
||||
(3, 3),
|
||||
(4, NULL),
|
||||
(2, NULL);
|
||||
|
||||
# true, false, null, false, null
|
||||
select a, oref, a in (select max(ie)
|
||||
from t1 where oref=t2.oref group by grp) from t2;
|
||||
|
||||
# This must have a trigcond
|
||||
explain extended
|
||||
select a, oref, a in (select max(ie)
|
||||
from t1 where oref=t2.oref group by grp) from t2;
|
||||
|
||||
# This must not have a trigcond:
|
||||
explain extended
|
||||
select a, oref from t2
|
||||
where a in (select max(ie) from t1 where oref=t2.oref group by grp);
|
||||
|
||||
|
||||
# Non-correlated subquery, 2 NULL evaluations
|
||||
create table t3 (a int);
|
||||
insert into t3 values (NULL), (NULL);
|
||||
flush status;
|
||||
select a in (select max(ie) from t1 where oref=4 group by grp) from t3;
|
||||
show status like 'Handler_read_rnd_next';
|
||||
select ' ^ This must show 11' Z;
|
||||
|
||||
# This must show trigcond:
|
||||
explain extended select a in (select max(ie) from t1 where oref=4 group by grp) from t3;
|
||||
|
||||
drop table t1, t2, t3;
|
||||
|
||||
#
|
||||
# 2. Subquery handled with 'index_subquery':
|
||||
#
|
||||
create table t1 (a int, oref int, key(a));
|
||||
insert into t1 values
|
||||
(1, 1),
|
||||
(1, NULL),
|
||||
(2, 3),
|
||||
(2, NULL),
|
||||
(3, NULL);
|
||||
|
||||
create table t2 (a int, oref int);
|
||||
insert into t2 values (1, 1), (2,2), (NULL, 3), (NULL, 4);
|
||||
|
||||
select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
|
||||
|
||||
# The next explain shows "using index" but that is just incorrect display
|
||||
# (there is a bug filed about this).
|
||||
explain extended
|
||||
select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
|
||||
|
||||
flush status;
|
||||
select oref, a from t2 where a in (select a from t1 where oref=t2.oref);
|
||||
# This will only show access to t2:
|
||||
show status like '%Handler_read_rnd_next';
|
||||
|
||||
# Check that repeated NULL-scans are not cached (subq. is not correlated):
|
||||
delete from t2;
|
||||
insert into t2 values (NULL, 0),(NULL, 0), (NULL, 0), (NULL, 0);
|
||||
|
||||
flush status;
|
||||
select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
|
||||
show status like '%Handler_read%';
|
||||
select 'No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1.' Z;
|
||||
|
||||
drop table t1, t2;
|
||||
|
||||
#
|
||||
# 3. Subquery handled with 'unique_index_subquery':
|
||||
#
|
||||
create table t1 (a int, b int, primary key (a));
|
||||
insert into t1 values (1,1), (3,1),(100,1);
|
||||
|
||||
create table t2 (a int, b int);
|
||||
insert into t2 values (1,1),(2,1),(NULL,1),(NULL,0);
|
||||
|
||||
select a,b, a in (select a from t1 where t1.b = t2.b) Z from t2 ;
|
||||
|
||||
drop table t1, t2;
|
||||
|
||||
#
|
||||
# 4. Subquery that is a join, with ref access
|
||||
#
|
||||
create table t1 (a int, b int, key(a));
|
||||
insert into t1 values
|
||||
(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
|
||||
|
||||
create table t2 like t1;
|
||||
insert into t2 select * from t1;
|
||||
update t2 set b=1;
|
||||
|
||||
create table t3 (a int, oref int);
|
||||
insert into t3 values (1, 1), (NULL,1), (NULL,0);
|
||||
select a, oref,
|
||||
t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z
|
||||
from t3;
|
||||
|
||||
# This must have trigcond in WHERE and HAVING:
|
||||
explain extended
|
||||
select a, oref,
|
||||
t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z
|
||||
from t3;
|
||||
|
||||
drop table t1, t2, t3;
|
||||
|
||||
Reference in New Issue
Block a user