SQL NOW()

NOW() 函数

NOW() 函数返回当前系统的日期和时间。

SQL NOW() 语法

SELECT NOW() FROM table_name;

演示数据库

在本教程中,我们将使用 web3 样本数据库。

下面是选自 "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  | 芝麻教程      | http://www.web3.xin/    | 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     |
+----+---------------+---------------------------+-------+---------+

SQL NOW() 实例

下面的 SQL 语句从 "Websites" 表中选取 name,url,及当天日期:

实例

SELECT name, url, Now() AS date
FROM Websites;
执行以上 SQL 输出结果如下:
mysql> select name, url, now() as date from  websites;
+---------------+---------------------------+---------------------+
| name          | url                       | date                |
+---------------+---------------------------+---------------------+
| Google        | https://www.google.cm/    | 2016-08-29 12:31:20 |
| 淘宝          | https://www.taobao.com/   | 2016-08-29 12:31:20 |
| 芝麻教程      | http://www.web3.xin/      | 2016-08-29 12:31:20 |
| 微博          | http://weibo.com/         | 2016-08-29 12:31:20 |
| Facebook      | https://www.facebook.com/ | 2016-08-29 12:31:20 |
| stackoverflow | http://stackoverflow.com/ | 2016-08-29 12:31:20 |
+---------------+---------------------------+---------------------+
6 rows in set (0.00 sec)

联系我们

邮箱 626512443@qq.com
电话 18611320371(微信)
QQ群 235681453

Copyright © 2015-2022

备案号:京ICP备15003423号-3