查找员工编号emp_now为10001其自入职以来的薪水salary涨幅值growth

题目描述

CREATE TABLE `salaries` (
`emp_no` int(11) NOT NULL,
`salary` int(11) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`from_date`));

解题方案

select (
(select salary from salaries where emp_no=10001 order by salary desc limit 1)
-
(select salary from salaries where emp_no=10001 order by salary asc limit 1)
) as growth