MySQL 如何检查是否设置了时间戳

首先让我们创建一个表−

mysql> create table DemoTable855(DueDate timestamp);
Query OK, 0 rows affected (0.54 sec)

使用插入命令将一些记录插入表中−

mysql> insert into DemoTable855 values('2019-08-07');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable855 values('0000-00-00');
Query OK, 1 row affected (0.27 sec)
mysql> insert into DemoTable855 values('2019-07-06');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable855 values('2016-04-10');
Query OK, 1 row affected (0.16 sec)

使用选择语句显示表中的所有记录−

mysql> select *from DemoTable855;

将会产生以下输出−

+----------------------+
| DueDate             |
+----------------------+
| 2019-08-07 00 −00 −00|
| 0000-00-00 00 −00 −00|
| 2019-07-06 00 −00 −00|
| 2016-04-10 00 −00 −00|
+----------------------+
4 rows in set (0.00 sec)

以下是检查MySQL中是否设置时间戳的查询−

mysql> select *from DemoTable855 where DueDate > 0;

将会产生以下输出−

+----------------------+
| DueDate              |
+----------------------+
| 2019-08-07 00 −00 −00|
| 2019-07-06 00 −00 −00|
| 2016-04-10 00 −00 −00|
+----------------------+
3 rows in set (0.03 sec)

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