题解 | #获取每个部门中当前员工薪水最高的相关信息#
获取当前薪水第二多的员工的emp_no以及其对应的薪水salary
http://www.nowcoder.com/practice/8d2c290cc4e24403b98ca82ce45d04db
窗口函数,子查询
SELECT t.emp_no, t.salary FROM ( SELECT *, DENSE_RANK() over( order by salary DESC ) ranking FROM salaries ) t WHERE t.ranking = 2
