左连接dept_emp和employees就好
查找所有已经分配部门的员工的last_name和first_name以及dept_no
https://www.nowcoder.com/practice/6d35b1cd593545ab985a68cd86f28671
select last_name,first_name,dept_no from dept_emp mp left join employees es on mp.emp_no = es.emp_no
查找所有已经分配部门的员工的last_name和first_name以及dept_no
https://www.nowcoder.com/practice/6d35b1cd593545ab985a68cd86f28671
select last_name,first_name,dept_no from dept_emp mp left join employees es on mp.emp_no = es.emp_no
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