MySQL时间类型1

（1）当前日期类型

mysql> create table thetime(t date);
Query OK, 0 rows affected (0.09 sec)

mysql> insert into thetime values(now());
Query OK, 1 row affected, 1 warning (0.06 sec)

mysql> select * from thetime;
+------------+
| t          |
+------------+
| 2013-04-28 |
+------------+
1 row in set (0.00 sec)

mysql>

（2）当前时间类型

mysql> create table thetime(t time);
Query OK, 0 rows affected (0.11 sec)

mysql> insert into thetime values(now());
Query OK, 1 row affected (0.30 sec)

mysql> select * from thetime;
+----------+
| t        |
+----------+
| 00:56:30 |
+----------+
1 row in set (0.00 sec)

mysql>

（3）当前日期和时间类型

mysql> create table thetime(t datetime);
Query OK, 0 rows affected (0.11 sec)

mysql> insert into thetime values(now());
Query OK, 1 row affected (0.09 sec)

mysql> select * from thetime;
+---------------------+
| t                   |
+---------------------+
| 2013-04-28 00:56:54 |
+---------------------+
1 row in set (0.00 sec)

mysql>

（4）获取当前日期和时间

 mysql> select now();
+---------------------+
| now()               |
+---------------------+
| 2013-04-28 01:02:58 |
+---------------------+
1 row in set (0.00 sec)

mysql>

总结：datetime（当前日期和时间） = date（当前日期） + time（当前时间）。