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;