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22 years ago
22 years ago
  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)
  6. def NULL 10 3.14
  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 Extra
  9. 1 SIMPLE t1 system NULL NULL NULL NULL 1
  10. Warnings:
  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);
  13. str strnull intg rel
  14. 0 0
  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
  18. drop table t1;
  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
  23. DROP TABLE t1;