54、SQL MIN() 函数

SQL中的 MIN() 函数返回指定列的最小值

 SELECT MIN(column_name) FROM table_name;

演示数据

先在 MySQL 数据库运行下面的语句创建测试数据

 CREATE DATABASE IF NOT EXISTS ddkk default character set utf8mb4 collate utf8mb4_unicode_ci;

USE ddkk;

DROP TABLE IF EXISTS lession;

CREATE TABLE lession (
    id int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
    name varchar(32) default '',
    views int(11) NOT NULL default '0',
    created_at DATETIME
);

INSERT INTO lession(id,name,views,created_at) VALUES
(1, 'Python itgogogo.cn IT gogogo',981,'2017-04-18 13:52:03'),
(2, 'Scala itgogogo.cn IT gogogo',73,'2017-04-18 16:03:32'),
(3, 'Ruby itgogogo.cn IT gogogo',199,'2017-05-01 06:16:14');

使用SELECT * FROM lession; 运行结果如下

 +----+---------------------+-------+--------------------+
| id | name               | views | created_at          |
+----+---------------------+-------+--------------------+
|  1 | Python itgogogo.cn IT gogogo     |   981 | 2017-04-18 13:52:03 |
|  2 | Scala itgogogo.cn IT gogogo      |    73 | 2017-04-18 16:03:32 |
|  3 | Ruby itgogogo.cn IT gogogo       |   199 | 2017-05-01 06:16:14 |
+----+---------------------+-------+--------------------+

总共有3 条记录

SQL MIN() 范例

下面的语句选取 访问量 ( views ) 最少的课程

 SELECT MIN(views) FROM lession;

运行结果如下

 mysql> SELECT MIN(views) FROM lession;
+------------+
| MIN(views) |
+------------+
|         73 |
+------------+