题解 |将三张表用left join关联起来即可
查找所有员工的last_name和first_name以及对应的dept_name
https://www.nowcoder.com/practice/5a7975fabe1146329cee4f670c27ad55
select
e.last_name,
e.first_name,
d.dept_name
from
employees e
left join dept_emp c on e.emp_no = c.emp_no
left join departments d on c.dept_no = d.dept_no
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