부서 매니저였던 사원들의 현재 직급을 출력하시오SELECT e.emp_no, CONCAT(e.first_name, ' ', e.last_name), t.titleFROM dept_manager AS mJOIN employees AS e ON e.emp_no = m.emp_noJOIN titles AS t ON e.emp_no = t.emp_noWHERE m.to_date != '9999-01-01'AND t.to_date = '9999-01-01';