题解
查找所有员工的last_name和first_name以及对应部门编号dept_no
https://www.nowcoder.com/practice/dbfafafb2ee2482aa390645abd4463bf
# 用左连接即可
select
a.last_name,
a.first_name,
b.dept_no
from
employees as a
left join
dept_emp as b
on
a.emp_no = b.emp_no;
