题解 | #获取所有员工当前的manager#
获取所有员工当前的manager
http://www.nowcoder.com/practice/e50d92b8673a440ebdf3a517b5b37d62
考点：join/not in
select e.emp_no, m.emp_no as manager
from dept_emp e
left join dept_manager m
on e.dept_no = m.dept_no
where e.emp_no != m.emp_no
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