[Today's Query] 부서 매니저였던 사원들의 현재 직급을 출력(2025/01/10)

부서 매니저였던 사원들의 현재 직급을 출력하시오

SELECT
	e.emp_no,
    CONCAT(e.first_name, ' ', e.last_name),
    t.title
FROM
	dept_manager AS m
JOIN
	employees AS e ON e.emp_no = m.emp_no
JOIN
	titles AS t ON e.emp_no = t.emp_no
WHERE
	m.to_date != '9999-01-01'
AND
	t.to_date = '9999-01-01';