题解 | #查找描述信息中包含robot的电影对应的分类名称以及电影数目，而且还需要该分类对应电影数量>=5部#
获取每个部门中当前员工薪水最高的相关信息
http://www.nowcoder.com/practice/4a052e3e1df5435880d4353eb18a91c6
select t.dept_no,n.emp_no,t.maxSalary
from (select s.*,d.dept_no
from salaries s
join dept_emp d
on s.emp_no = d.emp_no) n
join (select distinct d.dept_no,max(s.salary) maxSalary
from dept_emp d
join salaries s
on d.emp_no = s.emp_no
group by d.dept_no) t
on t.maxSalary = n.salary and n.dept_no = t.dept_no
order by t.dept_no;
