Найти текущие сведения о зарплате и номер отдела 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`)
);

SELECT salaries.emp_no, salary, salaries.from_date, salaries.to_date, dept_no 
FROM salaries, dept_manager 
WHERE salaries.emp_no = dept_manager.emp_no 
AND salaries.to_date = '9999-01-01' 
AND dept_manager.to_date = '9999-01-01'