SELECT a.dept_no, a.emp_no, a.salary as maxSalary FROM ( select d.dept_no, d.emp_no, s.salary ,RANK()over(partition by d.dept_no order by s.salary DESC) as rk FROM dept_emp as d, salaries as s WHERE d.emp_no = s.emp_no and d.to_date='9999-01-01' and s.to_date='9999-01-01' ) AS a...