数据库建表 there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause

建表时遇见的问题：there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause

参考方法：http://stackoverflow.com/questions/267658/

create table test_table(
id integer not null auto_increment primary key,
stamp_created timestamp default '0000-00-00 00:00:00',
stamp_updated timestamp default now() on update now()
);

insert into test_table(stamp_created, stamp_updated) values(null, null);

mysql> select * from t5;
+----+---------------------+---------------------+
| id | stamp_created       | stamp_updated       |
+----+---------------------+---------------------+
|  2 | 2009-04-30 09:44:35 | 2009-04-30 09:44:35 |
+----+---------------------+---------------------+
2 rows in set (0.00 sec)

对于timestamp default '0000-00-00 00:00:00'字段插入null，结果返回当前时间 还是蛮意外的。