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(salary) as sum
from departments d
join dept_emp de on d.dept_no = de.dept_no
join salaries s on de.emp_no = s.emp_no
group by dept_no
order by dept_no
投递货拉拉等公司8个岗位 >