题解 | #获取所有员工当前的manager#

子查询 + 连表方式

-- 先查出不是经理的员工
select emp_no, dept_no from dept_emp where emp_no not in (select emp_no from dept_manager);

select e.emp_no, d.emp_no as manager
from dept_manager d , (select emp_no, dept_no from dept_emp where emp_no not in (select emp_no from dept_manager)) as e
where d.dept_no = e.dept_no;