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bell@sanja.is.com.ua
2004-05-14 13:33:02 +03:00
parent a71771788e 8885ce0dd7
commit 71a374dc13
11 changed files with 177 additions and 72 deletions
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23
mysql-test/r/union.result
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@ -86,6 +86,7 @@ explain extended (select a,b from t1 limit 2) union all (select a,b from t2 ord
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 UNION t2 ALL NULL NULL NULL NULL 4 Using filesort
-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL Using filesort
Warnings:
Note 1003 (select test.t1.a AS `a`,test.t1.b AS `b` from test.t1 limit 2) union all (select test.t2.a AS `a`,test.t2.b AS `b` from test.t2 order by test.t2.a limit 1) order by b desc
(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
@ -106,21 +107,15 @@ explain select a,b from t1 union all select a,b from t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 UNION t2 ALL NULL NULL NULL NULL 4
-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
explain select xx from t1 union select 1;
ERROR 42S22: Unknown column 'xx' in 'field list'
explain select a,b from t1 union select 1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
ERROR 21000: The used SELECT statements have a different number of columns
explain select 1 union select a,b from t1 union select 1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
2 UNION t1 ALL NULL NULL NULL NULL 4
3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
ERROR 21000: The used SELECT statements have a different number of columns
explain select a,b from t1 union select 1 limit 0;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 UNION NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
ERROR 21000: The used SELECT statements have a different number of columns
select a,b from t1 into outfile 'skr' union select a,b from t2;
ERROR HY000: Wrong usage of UNION and INTO
select a,b from t1 order by a union select a,b from t2;
@ -475,6 +470,7 @@ explain extended (select * from t1 where a=1) union (select * from t2 where a=1)
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1
2 UNION t2 const PRIMARY PRIMARY 4 const 1
-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
Warnings:
Note 1003 (select test.t1.a AS `a`,test.t1.b AS `b` from test.t1 where (test.t1.a = 1)) union (select test.t2.a AS `a`,test.t2.b AS `b` from test.t2 where (test.t2.a = 1))
(select * from t1 where a=5) union (select * from t2 where a=1);
@ -497,10 +493,12 @@ 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 UNION t1 index PRIMARY PRIMARY 4 NULL 4 Using index
2 UNION t2 index PRIMARY PRIMARY 4 NULL 3 Using where; Using index
-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
explain (select * from t1 where a=1) union (select * from t1 where b=1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1
2 UNION t1 ref b b 5 const 1 Using where
-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
drop table t1,t2;
create table t1 ( id int not null auto_increment, primary key (id) ,user_name text );
create table t2 ( id int not null auto_increment, primary key (id) ,group_name text );
@ -950,3 +948,8 @@ a
1
drop table t1, t2;
set sql_select_limit=default;
CREATE TABLE t1 (i int(11) default NULL,c char(1) default NULL,KEY i (i));
CREATE TABLE t2 (i int(11) default NULL,c char(1) default NULL,KEY i (i));
explain (select * from t1) union (select * from t2) order by not_existing_column;
ERROR 42S22: Unknown column 'not_existing_column' in 'order clause'
drop table t1, t2;