题解 | #获取所有非manager的员工emp_no#
获取所有非manager的员工emp_no
http://www.nowcoder.com/practice/32c53d06443346f4a2f2ca733c19660c
select a.emp_no from( select emp_no from employees )a left join ( select emp_no,dept_no from dept_manager )b on a.emp_no=b.emp_no where b.dept_no is null