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 ))