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xuthus / 数据库SQL实战SQLMIT

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24.获取所有非manager员工当前的薪水情况.md 1.45 KB
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xuthus authored 2019-08-03 23:19 . add:22-25

获取所有非manager员工当前的薪水情况

题目描述

获取所有非manager员工当前的薪水情况,给出dept_no、emp_no以及salary ,当前表示to_date='9999-01-01'

CREATE TABLE `dept_emp` (
`emp_no` int(11) NOT NULL,
`dept_no` char(4) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`dept_no`));
CREATE TABLE `dept_manager` (
`dept_no` char(4) NOT NULL,
`emp_no` int(11) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`dept_no`));
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`));

答案

select dept_no,s.emp_no,salary from (select * from employees where emp_no not in (select emp_no from dept_manager)) emp, salaries s,dept_emp de where emp.emp_no = s.emp_no and s.to_date = '9999-01-01' and emp.emp_no = de.emp_no

题解

1、获取所有的manager的no

select emp_no from dept_manager

2、获取所有非manager的信息表 emp

select * from employees where emp_no not in (select emp_no from dept_manager)

3、拼接emp,salaries,dept_emp表 获取答案结果集

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