题解 | #统计各个部门的工资记录数#
统计各个部门的工资记录数
https://www.nowcoder.com/practice/6a62b6c0a7324350a6d9959fa7c21db3
select
d.dept_no,
d.dept_name,
count(*) as sum
from
departments d
left join dept_emp de on d.dept_no = de.dept_no
left join salaries s on de.emp_no = s.emp_no
group by
d.dept_no
order by
d.dept_no asc
