select last_name,first_name,d.dept_no from employees e left join dept_emp d on e.emp_no = d.emp_no where e.emp_no in (select emp_no from employees);
select last_name,first_name,d.dept_no from employees e left join dept_emp d on e.emp_no = d.emp_no where e.emp_no in (select emp_no from employees);