数据库SQL实战

题目描述

查找各个部门当前(to_date='9999-01-01')领导当前薪水详情以及其对应部门编号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 `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:

输出描述:

 
   
emp_no salary from_date to_date dept_no
10002 72527 2001-08-02 9999-01-01 d001
10004 74057 2001-11-27 9999-01-01 d004
10005 94692 2001-09-09 9999-01-01 d003
10006 43311 2001-08-02 9999-01-01 d002
10010 94409 2001-11-23 9999-01-01 d006
示例1

输入

输出

select s.*, d.dept_no from salaries s, dept_manager d

where s.emp_no = d.emp_no
and s.to_date = '9999-01-01'
and d.to_date = '9999-01-01'

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