Sort MySQL Query

Sort MySQL query syntax

SELECT 查询列表 FROM 表
WHERE 筛选条件
ORDER BY 排序列表#asc升序,desc降序,默认升序

Increase Filters

#查询部门编号大于等于90的员工信息,按入职时间排序
SELECT * FROM employee
WHERE   department_id>=90
ORDER BY hiredate;

Sort by expression

#按年薪的高低显示员工的信息和年薪
SELECT *,salary*12 年薪
FROM employee
ORDER BY salary*12;

Sort by Alias

#按年薪的高低显示员工的信息和年薪
SELECT *,salary*12 年薪
FROM employee
ORDER BY 年薪;

Sort by function

#按姓名的长度显示员工的姓名
SELECT LENGTH(last_name) 长度,last_name
FROM employee
ORDER BY 长度;
#支持多变量比较,比较优先级从左至右