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 a.dept_no,b.dept_name,sum(a.sum) as sum from (select t.*,d.dept_no from (select emp_no,count(emp_no) as sum from salaries group by emp_no)t left join dept_emp d on t.emp_no=d.emp_no)a left join departments b on a.dept_no=b.dept_no group by a.dept_no,b.dept_name order by dept_no
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