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,d.dept_name,count(dept_salary.salary) as sum
from departments d
#部门与薪水对照表
join (
select de.dept_no,s.salary
from dept_emp de
join salaries s
on de.emp_no = s.emp_no
) as dept_salary
on d.dept_no = dept_salary.dept_no
group by dept_no
order by dept_no;
查看14道真题和解析