SQL SELECT DISTINCT 语句

1、语法一：SELECT DISTINCT 列名称 FROM 表名称

图中为student表内容

2、查询名叫李四的学生值显示一次

SELECT DISTINCT `name` FROM student

3、根据age排序

SELECT DISTINCT `name` FROM student ORDER BY age

4、根据name,age排序，从左至右优先顺序

SELECT DISTINCT `name` FROM student ORDER BY `name`,age

5、按条件查询name为李四的学生

SELECT `name` FROM student WHERE `name`='李四'

6、加上DISTINCT 去掉重复

SELECT DISTINCT `name` FROM student WHERE `name`='李四'