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
方法一 NOT IN+子查询
select emp_no
from employees
where emp_no not in (select emp_no from dept_manager);
方法二 左连接去中
SELECT e.emp_no
FROM employees e
left join dept_manager d ON e.emp_no = d.emp_no
where d.emp_no is NULL;
