SQL MAX() 函数

SQL 教程 · 2019-03-04 08:28:20

MAX() 函数

MAX() 函数返回指定列的最大值。

SQL MAX() 语法

SELECT MAX(column_name) FROM table_name;

演示数据库

在本教程中,我们将使用 CODERCTO 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  | 码农教程      | http://www.codercto.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     |
+----+---------------+---------------------------+-------+---------+

SQL MAX() 实例

下面的 SQL 语句从 "Websites" 表的 "alexa" 列获取最大值:

实例

SELECT MAX(alexa) AS max_alexa FROM Websites;

执行以上 SQL 结果如下所示:

点击查看所有 SQL 教程 文章: https://codercto.com/courses/l/29.html

查看所有标签

How Great Decisions Get Made

How Great Decisions Get Made

Maruska, Don / 2006-2 / $ 20.28

All too often, solving tough work issues can become a tug of war as clashing departments, priorities, personality styles, and other concerns threaten to destroy any possibility of a successful conclus......一起来看看 《How Great Decisions Get Made》 这本书的介绍吧!

RGB转16进制工具
RGB转16进制工具

RGB HEX 互转工具

SHA 加密
SHA 加密

SHA 加密工具

HEX HSV 转换工具
HEX HSV 转换工具

HEX HSV 互换工具