题目描述
查找所有员工自入职以来的薪水涨幅情况，给出员工编号emp_no以及其对应的薪水涨幅growth，并按照growth进行升序
CREATE TABLE `employees` (
`emp_no` int(11) NOT NULL,
`birth_date` date NOT NULL,
`first_name` varchar(14) NOT NULL,
`last_name` varchar(16) NOT NULL,
`gender` char(1) NOT NULL,
`hire_date` date NOT NULL,
PRIMARY KEY (`emp_no`));
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`));
CREATE TABLE `employees` (
`emp_no` int(11) NOT NULL,
`birth_date` date NOT NULL,
`first_name` varchar(14) NOT NULL,
`last_name` varchar(16) NOT NULL,
`gender` char(1) NOT NULL,
`hire_date` date NOT NULL,
PRIMARY KEY (`emp_no`));
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 | growth |
|---|---|
| 10011 | 0 |
| 省略 | 省略 |
| 10010 | 54496 |
| 10004 | 34003 |
SQL:
select sCurrent.emp_no,(sCurrent.salary-sStart.salary)as growth
from(select emp_no,salary from salaries where to_date='9999-01-01')as sCurrent,
(select e.emp_no,c.salary from employees e,salaries c where e.emp_no=c.emp_no and c.from_date=e.hire_date)as sStart
where sCurrent.emp_no=sStart.emp_no
order by growth
分别找出 当前的工资 以及入职时工资 将这两张表进行连接 然后计算出growth