Create Table: CREATE TABLE `RecruitmentDesc` (`sn` int(11) NOT NULL AUTO_INCREMENT COMMENT '编号（自增字段）',`areaSn` int(11) NOT NULL COMMENT '地区编号',`title` varchar(50) NOT NULL COMMENT '职位标题',`content` text NOT NULL COMMENT '职位描述',`status` tinyint(4) NOT NULL DEFAULT '1' COMMENT '状态 1可用 2不可用',`personNum` int(11) NOT NULL DEFAULT '0' COMMENT '招聘人数 0-若干',`actionTime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '启用时间',`dueTime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '到期时间',`createTime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '创建时间',`updateTime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '更新时间',PRIMARY KEY (`sn`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='诚聘英才表'
1 row in set (0.00 sec)mysql> ALTER TABLE `RecruitmentDesc` MODIFY COLUMN `status` TINYINT NOT NULL DEFAULT 2 COMMENT '状态 1可用 2不可用';
ERROR 1067 (42000): Invalid default value for 'dueTime'Create Table: CREATE TABLE `RecruitmentDesc111` (`sn` int(11) NOT NULL AUTO_INCREMENT COMMENT '编号（自增字段）',`areaSn` int(11) NOT NULL COMMENT '地区编号',`title` varchar(50) NOT NULL COMMENT '职位标题',`content` text NOT NULL COMMENT '职位描述',`status` tinyint(4) NOT NULL DEFAULT '1' COMMENT '状态 1可用 2不可用',`personNum` int(11) NOT NULL DEFAULT '0' COMMENT '招聘人数 0-若干',`actionTime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '启用时间',`dueTime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '到期时间',`createTime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '创建时间',`updateTime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '更新时间',PRIMARY KEY (`sn`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='诚聘英才表tinyint
从 0 到 255 的整型数据。存储大小为 1 字节。ALTER TABLE `RecruitmentDesc` MODIFY COLUMN `dueTime` timestamp  NOT NULL DEFAULT '2016-03-23 00:00:00' , MODIFY COLUMN `createTime` timestamp  NOT NULL DEFAULT '2016-03-23 00:00:00' , MODIFY COLUMN `updateTime` timestamp NOT NULL DEFAULT  '2016-03-23 00:00:00' ;ALTER TABLE `RecruitmentDesc` MODIFY COLUMN `dueTime` timestamp  NOT NULL DEFAULT now() , MODIFY COLUMN `createTime` timestamp  NOT NULL DEFAULT now()  , MODIFY COLUMN `updateTime` timestamp NOT NULL DEFAULT  now() ;create table test100(id TINYINT,dueTime NOT NULL DEFAULT now());mysql> desc test100-> ;
+---------+------------+------+-----+-------------------+-------+
| Field   | Type       | Null | Key | Default           | Extra |
+---------+------------+------+-----+-------------------+-------+
| id      | tinyint(4) | YES  |     | NULL              |       |
| dueTime | timestamp  | NO   |     | CURRENT_TIMESTAMP |       |
+---------+------------+------+-----+-------------------+-------+
2 rows in set (0.00 sec)mysql> select * from test100;
Empty set (0.00 sec)mysql> insert into test100 values(1, default);
Query OK, 1 row affected (0.03 sec)mysql> select * from test100;
+------+---------------------+
| id   | dueTime             |
+------+---------------------+
|    1 | 2016-03-23 17:37:19 |
+------+---------------------+
1 row in set (0.00 sec)mysql> insert into test100(id) values(20);
Query OK, 1 row affected (0.01 sec)mysql> select * from test00;
ERROR 1146 (42S02): Table 'zjzc.test00' doesn't exist
mysql> select * from test100;
+------+---------------------+
| id   | dueTime             |
+------+---------------------+
|    1 | 2016-03-23 17:37:19 |
|   20 | 2016-03-23 17:38:24 |
+------+---------------------+
2 rows in set (0.00 sec)