假定有一个数据库，其中有一个表：

mysql> describe imei;

+-------+-------------+------+-----+-------------------+-------+

| Field | Type | Null | Key | Default | Extra |

+-------+-------------+------+-----+-------------------+-------+

| imei | varchar(20) | NO | | NULL | |

| date | datetime | NO | | CURRENT_TIMESTAMP | |

+-------+-------------+------+-----+-------------------+-------+

2 rows in set (0.02 sec)

mysql>

然后向这个表中插入了一些数据，如下：

mysql> select * from imei;

+---------+---------------------+

| imei | date |

+---------+---------------------+

| 12345 | 2016-05-23 19:55:07 |

| 12345 | 2016-05-23 19:57:22 |

| 123456 | 2016-05-23 19:57:30 |

| 1234567 | 2016-05-23 19:57:38 |

| 12345 | 2016-05-23 20:13:24 |

+---------+---------------------+

5 rows in set (0.00 sec)

mysql>

再插入一条记录：

mysql> insert into imei values('12345678', date('2016-05-23 20:24:00'));

Query OK, 1 row affected (0.03 sec)

mysql> select * from imei;

+----------+---------------------+

| imei | date |

+----------+---------------------+

| 12345 | 2016-05-23 19:55:07 |

| 12345 | 2016-05-23 19:57:22 |

| 123456 | 2016-05-23 19:57:30 |

| 1234567 | 2016-05-23 19:57:38 |

| 12345 | 2016-05-23 20:13:24 |

| 12345678 | 2016-05-23 00:00:00 |

+----------+---------------------+

6 rows in set (0.00 sec)

mysql>

现在删除一些数据：

mysql> delete from imei where date < TIME('2016-05-23 20:10:00');

Query OK, 5 rows affected (0.03 sec)

mysql> select * from imei;

+-------+---------------------+

| imei | date |

+-------+---------------------+

| 12345 | 2016-05-23 20:13:24 |

+-------+---------------------+

1 row in set (0.00 sec)

mysql>

通过上面insert命令的例子，可以知道DATE是只取日期，而丢弃时间部分。所以完整的日期+时间，就用TIME函数。——如delete示例所示。