第一步:获取manager的员工
select emp_no from dept_manager
第二步:获取非manager的员工
select emp_no from employees where emp_no not in (select emp_no from dept_manager )
第三步:联结dept_emp,salaries
select de.dept_no,de.emp_no,s.salary from salaries s inner join dept_emp de on s.emp_no=de.emp_no where de.emp_no in (select emp_no from employees where emp_no not in (select emp_no from dept_manager ))