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 departments.dept_no,departments.dept_name,count(*) as sum from departments join dept_emp on departments.dept_no = dept_emp.dept_no join salaries on dept_emp.emp_no = salaries.emp_no group by departments.dept_no order by departments.dept_no
