題目描述

獲取所有部門當前manager的當前薪水情況，給出dept_no, emp_no以及salary，當前表示to_date='9999-01-01'
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`));

select dept_manager.dept_no, dept_manager.emp_no, salaries.salary
    from dept_manager, salaries
        where dept_manager.emp_no = salaries.emp_no and dept_manager.to_date='9999-01-01'
            and salaries.to_date='9999-01-01'