使用窗口函数求解
获取每个部门中当前员工薪水最高的相关信息
http://www.nowcoder.com/questionTerminal/4a052e3e1df5435880d4353eb18a91c6
select d.dept_no, d.emp_no, d.salary from (select c.dept_no,c.emp_no,c.salary, row_number() over(partition by c.dept_no order by c.salary desc) as ranking from (select a.dept_no,a.emp_no,b.salary from dept_emp as a inner join salaries as b on a.emp_no = b.emp_no) c )d where d.ranking = 1 order by d.dept_no;
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