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 b.dept_no,b.dept_name,count(c.salary)as sum from dept_emp as a inner join departments as b on a.dept_no=b.dept_no inner join salaries as c on c.emp_no=a.emp_no group by b.dept_no order by b.dept_no
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