MySQL 如何在NOW()和CURDATE()函数中使用INTERVAL关键字？

使用MySQL的NOW()和CURDATE()函数中的INTERVAL关键字可以像在日期值的时间、日期或日期时间单位中使用一样使用。

阅读更多：MySQL 教程

示例

使用MySQL的NOW()函数和INTERVAL关键字

mysql> Select NOW() + INTERVAL 2 day;
+------------------------+
| NOW() + INTERVAL 2 day |
+------------------------+
| 2017-10-30 09:19:31    |
+------------------------+
1 row in set (0.00 sec)

mysql> Select NOW() - INTERVAL 2 day;
+------------------------+
| NOW() - INTERVAL 2 day |
+------------------------+
| 2017-10-26 09:19:45    |
+------------------------+
1 row in set (0.00 sec)

mysql> Select NOW() - INTERVAL 2 hour;
+-------------------------+
| NOW() - INTERVAL 2 hour |
+-------------------------+
| 2017-10-28 07:19:51     |
+-------------------------+
1 row in set (0.00 sec)

示例

使用MySQL的CURDATE()函数和INTERVAL关键字

mysql> Select CURDATE() - INTERVAL 2 day;
+----------------------------+
| CURDATE() - INTERVAL 2 day |
+----------------------------+
| 2017-10-26                 |
+----------------------------+
1 row in set (0.00 sec)

mysql> Select CURDATE() + INTERVAL 2 day;
+----------------------------+
| CURDATE() + INTERVAL 2 day |
+----------------------------+
| 2017-10-30                 |
+----------------------------+
1 row in set (0.00 sec)