MySQL中的时态(日期/时间)数据类型

时态类型的取值范围

 mysql> create table t (dt datetime,d date,t time);
 Query OK, 0 rows affected (0.30 sec)

 mysql> insert into t (dt,d,t) values (now(),now(),now());
 Query OK, 1 row affected, 1 warning (0.08 sec)

 mysql> select * from t;
 +---------------------+------------+----------+
 | dt                  | d          | t        |
 +---------------------+------------+----------+
 | 2017-12-20 21:39:42 | 2017-12-20 | 21:39:42 |
 +---------------------+------------+----------+
 1 row in set (0.00 sec)