MAX() 函数

MAX() 函数

回指定列的最大值。

语法

SELECT MAX(column_name) 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/    | 5000  | CN      |
| 4  | 微博          | http://weibo.com/         | 20    | CN      |
| 5  | Facebook     | https://www.facebook.com/ | 3     | USA     |
|  6 | 百度         | https://www.baidu.com/    |     4 | CN      |
|  7 | stackoverflow | http://stackoverflow.com/ |     0 | IND     |
+----+---------------+---------------------------+-------+---------+

从 "Websites" 表的 "alexa" 列获取最大值：

SELECT MAX(alexa) AS max_alexa FROM Websites;

输出结果：

mysql> SELECT MAX(alexa) AS max_alexa FROM Websites;

+-----------+
| max_alexa |
+-----------+
|5000       |
+-----------+