1 drop table if exists t1,t2;
2 create table t1(str varchar(10) default 'def',strnull varchar(10),intg int default '10',rel double default '3.14');
3 insert into t1 values ('','',0,0.0);
4 select default(str), default(strnull), default(intg), default(rel) from t1;
5 default(str) default(strnull) default(intg) default(rel)
7 explain extended select default(str), default(strnull), default(intg), default(rel) from t1;
8 id select_type table type possible_keys key key_len ref rows filtered Extra
9 1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
11 Note 1003 select default('') AS `default(str)`,default('') AS `default(strnull)`,default('0') AS `default(intg)`,default('0') AS `default(rel)` from `test`.`t1`
12 select * from t1 where str <> default(str);
15 explain select * from t1 where str <> default(str);
16 id select_type table type possible_keys key key_len ref rows Extra
17 1 SIMPLE t1 system NULL NULL NULL NULL 1
19 CREATE TABLE t1 (id int(11), s varchar(20));
20 INSERT INTO t1 VALUES (1, 'one'), (2, 'two'), (3, 'three');
21 SELECT s, 32 AS mi FROM t1 GROUP BY s HAVING DEFAULT(mi) IS NULL;
22 ERROR HY000: Field 'mi' doesn't have a default value