select d1.emp_no,d2.emp_no,s.salary,s2.salary from dept_emp d1 join dept_manager d2 (on d1.dept_no=d2.dept_no) join salaries s on (d1.emp_no=s.emp_no) left join salaries s2 on (d2.emp_no=s2.emp_no) where (s.salary>s2.salary) and (d1.emp_no<>d2.emp_no)