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LeetCode: 177. 第N高的薪水

1、题目描述

编写一个 SQL 查询,获取 Employee 表中第 n 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 n 高的薪水,那么查询应返回 null

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

2、解题思路

CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT

BEGIN

declare M INT;
set M = N-1;

  RETURN (
      # Write your MySQL query statement below.
      select distinct Salary  from Employee order by Salary DESC limit M,1 

  );
END