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
http://www.nowcoder.com/practice/6a62b6c0a7324350a6d9959fa7c21db3
select d.dept_no,d.dept_name,count(*) sum
from
(departments d inner join dept_emp de
on d.dept_no=de.dept_no) t inner join salaries s
on t.emp_no=s.emp_no
group by d.dept_no
order by d.dept_no;
