diff options
Diffstat (limited to 'mysql-test/t/derived.test')
| -rw-r--r-- | mysql-test/t/derived.test | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/mysql-test/t/derived.test b/mysql-test/t/derived.test index 154fc4b3834..b412555f1e8 100644 --- a/mysql-test/t/derived.test +++ b/mysql-test/t/derived.test @@ -183,3 +183,12 @@ CREATE TABLE t3 ( 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; |