NOW() 函数

返回当前系统的日期和时间。

语法

SELECT NOW() FROM table_name;

示例

"Websites" 表的数据：

+----+--------------+---------------------------+-------+---------+
| id | name         | url                       | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1  | Google       | https://www.google.cm/    | 1     | USA     |
| 2  | 淘宝          | https://www.taobao.com/   | 13    | CN      |
| 3  | 菜鸟教程      | http://www.runoob.com/    | 4689  | CN      |
| 4  | 微博          | http://weibo.com/         | 20    | CN      |
| 5  | Facebook     | https://www.facebook.com/ | 3     | USA     |
| 7  | stackoverflow | http://stackoverflow.com/ |   0 | IND     |
+----+---------------+---------------------------+-------+---------+

从 "Websites" 表中选取 name，url，及当天日期：

SELECT name, url, Now() AS date
FROM Websites;

输出结果：

mysql> SELECT name, url, Now() AS date
    -> FROM Websites;

+--------------+---------------------------+------------------------+
| name         | url                       | date                    |
+--------------+---------------------------+-------------------------+
| Google       | https://www.google.cm/    | 2018-03-07 17:09:33    |
| 淘宝          | https://www.taobao.com/   | 2018-03-07 17:09:33     |
| 菜鸟教程      | http://www.runoob.com/    |2018-03-07 17:09:33     |
| 微博          | http://weibo.com/         |2018-03-07 17:09:33     |
| Facebook     | https://www.facebook.com/ | 2018-03-07 17:09:33    |
| stackoverflow | http://stackoverflow.com/ | 2018-03-07 17:09:33    |
+---------------+---------------------------+-------------------------+