ORDER BY 关键字

ORDER BY 关键字用于对结果集按照一个列或者多个列进行排序。

ORDER BY 关键字默认按照升序对记录进行排序。使用 DESC 关键字进行降序排序。

语法

SELECT column_name,column_name
FROM table_name
ORDER BY column_name,column_name ASC|DESC;

Websites 表：

+----+--------------+---------------------------+-------+---------+
| 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     |
+----+--------------+---------------------------+-------+---------+

ORDER BY 实例

SELECT  * FROM Websites
ORDER BY alexa;

输出结果：ORDER BY DESC 实例

降序排序

SELECT  * FROM Websites
ORDER BY alexa DESC;

ORDER BY 多列

SELECT * FROM Websites
ORDER BY country,alexa;

输出结果：