27. 给出每个员工每年薪水涨幅超过5000的员工编号emp_no

题目描述

给出每个员工每年薪水涨幅超过5000的员工编号emp_no、薪水变更开始日期from_date以及薪水涨幅值salary_growth，并按照salary_growth逆序排列。

提示：在sqlite中获取datetime时间对应的年份函数为strftime('%Y', to_date)
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`));

输入描述:

无

输出描述:

emp_no	from_date	salary_growth
10003	1995-12-03	24178
10008	1998-03-11	20843
10008	2000-03-10	5997

SELECT
	s2.emp_no,
	s2.from_date,
	(s2.salary - s1.salary) AS salary_growth
FROM
	salaries s1,
	salaries s2
WHERE
	s1.emp_no = s2.emp_no
AND salary_growth > 5000
AND (
	strftime ('%Y', s2.to_date) - strftime ('%Y', s1.to_date) = 1
	OR strftime ('%Y', s2.from_date) - strftime ('%Y', s1.from_date) = 1
)
ORDER BY
	salary_growth DESC;