mysql查询之获取第n高薪水

获取 Employee 表中第 高的薪水(Salary)

+----+--------+
| Id | Salary |
+----+--------+
| 1  | 100    |
| 2  | 200    |
| 3  | 300    |
+----+--------+

例如上述 Employee 表,n = 2 时,应返回第二高的薪水 200。如果不存在第 高的薪水,那么查询应返回 null

+------------------------+
| getNthHighestSalary(2) |
+------------------------+
| 200                    |
+------------------------+

 

CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
    Set N=N-1;
  RETURN (
      select distinct Salary  from Employee order by Salary desc limit N,1
  );
END

 

posted @ 2019-05-06 13:56  慕尘  阅读(968)  评论(0编辑  收藏  举报