diff options
Diffstat (limited to 'mysql-test/t/derived.test')
| -rw-r--r-- | mysql-test/t/derived.test | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/mysql-test/t/derived.test b/mysql-test/t/derived.test index caf673d95c1..a9341ada416 100644 --- a/mysql-test/t/derived.test +++ b/mysql-test/t/derived.test @@ -35,6 +35,7 @@ select a from (select 1 as a) as b; select 1 from (select 1) as a; select * from (select * from t1 union select * from t1) a; select * from (select * from t1 union all select * from t1) a; +select * from (select * from t1 union all select * from t1 limit 2) a; explain select * from (select * from t1 union select * from t1) a; explain select * from (select * from t1 union all select * from t1) a; CREATE TABLE t2 (a int not null); @@ -115,7 +116,7 @@ select mail_id, if(folder.f_description!='', folder.f_description, folder.f_nam # create table t1 (a int); insert into t1 values (1),(2),(3); --- error 1149 +-- error 1287 update (select * from t1) as t1 set a = 5; -- error 1064 delete from (select * from t1); @@ -138,3 +139,70 @@ insert into t1 values (1),(2); select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b; explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b; drop table t1; + + +# +# multi-update & multi-delete with derived tables +# +CREATE TABLE `t1` ( + `N` int(11) unsigned NOT NULL default '0', + `M` tinyint(1) default '0', +) ENGINE=MyISAM DEFAULT CHARSET=latin1; +INSERT INTO `t1` (N, M) VALUES (1, 0),(1, 0),(1, 0),(2, 0),(2, 0),(3, 0); +UPDATE `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2; +select * from t1; +-- error 1287 +UPDATE `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2, P2.N = 2; +-- error 1054 +UPDATE `t1` AS P1 INNER JOIN (SELECT aaaa FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2; +delete P1.* from `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N; +select * from t1; +-- error 1287 +delete P1.*,P2.* from `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N; +-- error 1054 +delete P1.* from `t1` AS P1 INNER JOIN (SELECT aaa FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N; +drop table t1; + +# +# correct lex->current_select +# +CREATE TABLE t1 ( + OBJECTID int(11) NOT NULL default '0', + SORTORDER int(11) NOT NULL auto_increment, + KEY t1_SortIndex (SORTORDER), + KEY t1_IdIndex (OBJECTID) +) ENGINE=MyISAM DEFAULT CHARSET=latin1; +CREATE TABLE t2 ( + ID int(11) default NULL, + PARID int(11) default NULL, + UNIQUE KEY t2_ID_IDX (ID), + KEY t2_PARID_IDX (PARID) +) engine=MyISAM DEFAULT CHARSET=latin1; +INSERT INTO t2 VALUES (1000,0),(1001,0),(1002,0),(1003,0),(1008,1),(1009,1),(1010,1),(1011,1),(1016,2); +CREATE TABLE t3 ( + ID int(11) default NULL, + DATA decimal(10,2) default NULL, + UNIQUE KEY t3_ID_IDX (ID) +) engine=MyISAM DEFAULT CHARSET=latin1; +INSERT INTO t3 VALUES (1000,0.00),(1001,0.25),(1002,0.50),(1003,0.75),(1008,1.00),(1009,1.25),(1010,1.50),(1011,1.75); +select 497, TMP.ID, NULL from (select 497 as ID, MAX(t3.DATA) as DATA from t1 join t2 on (t1.ObjectID = t2.ID) join t3 on (t1.ObjectID = t3.ID) group by t2.ParID order by DATA DESC) as TMP; +drop table t1, t2, t3; + + +# +# explain derived +# +CREATE TABLE t1 (name char(1) default NULL, val int(5) default NULL); +INSERT INTO t1 VALUES ('a',1), ('a',2), ('a',2), ('a',2), ('a',3), ('a',6), ('a',7), ('a',11), ('a',11), ('a',12), ('a',13), ('a',13), ('a',20), ('b',2), ('b',3), ('b',4), ('b',5); +SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x, t1 y WHERE x.name=y.name GROUP BY x.name, x.val HAVING SUM(y.val <= x.val) >= COUNT(*)/2 AND SUM(y.val >= x.val) >= COUNT(*)/2) AS s GROUP BY s.name; +explain SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x, t1 y WHERE x.name=y.name GROUP BY x.name, x.val HAVING SUM(y.val <= x.val) >= COUNT(*)/2 AND SUM(y.val >= x.val) >= COUNT(*)/2) AS s GROUP BY s.name; +drop table t1; + +# +# "Using index" in explain +# +create table t2 (a int, b int, primary key (a)); +insert into t2 values (1,7),(2,7); +explain select a from t2 where a>1; +explain select a from (select a from t2 where a>1) tt; +drop table t2; |