select dept_no, s.emp_no, salary as max_Salary from salaries s join dept_emp de on s.emp_no = de.emp_no where (dept_no, salary) in ( select dept_no, max(salary) from salaries s join dept_emp de on s.emp_no = de.emp_no where s.to_date = '9999-01-01' group by dept_no ) order by dept_no