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,
dept_name,
count(*) sum
from departments d
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
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