892
892
explain extended SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1;
893
893
id select_type table type possible_keys key key_len ref rows filtered Extra
894
894
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 100.00 Using index
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896
2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
898
898
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`
900
900
#LIMIT is not supported now
901
901
#create table t1 (a float) ENGINE=MyISAM;
903
903
#select 10.5 IN (SELECT * from t1 LIMIT 1);
905
905
#select 10.5 IN (SELECT * from t1 LIMIT 1 UNION SELECT 1.5);