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
# 用窗口函数统计出记录数sum,然后再用distinct去重
select distinct dept_no,dept_name,sum
from
(
select d.dept_no,d.dept_name,count(s.salary) over (partition by d.dept_no) 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
order by d.dept_no
) as a
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