select d.emp_no ,de.emp_no,s1.salary,s2.salary 
from dept_emp d 
left join  dept_manager de on d.dept_no=de.dept_no 
left join salaries s1 on d.emp_no=s1.emp_no  
left join salaries s2 on de.emp_no=s2.emp_no 
where de.emp_no != d.emp_no and s1.salary>s2.salary