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,dep.dept_name,count(d.emp_no) from dept_emp d join departments dep on d.dept_no =dep.dept_no join salaries s on s.emp_no = d.emp_no group by d.dept_no order by d.dept_no