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 dp.dept_no dept_no,dp.dept_name dept_name,count(ds.salary) sum from departments dp join (select salary,de.dept_no from dept_emp de join salaries sa on de.emp_no=sa.emp_no) ds on dp.dept_no=ds.dept_no group by dp.dept_no order by dp.dept_no