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                    |
+------------------------+

链接：https://leetcode-cn.com/problems/nth-highest-salary

题解

CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
    SET N := N - 1;
  RETURN (
      # Write your MySQL query statement below.
      SELECT (
          SELECT DISTINCT Salary
          FROM Employee
          ORDER BY Salary DESC
          LIMIT 1 OFFSET N
      )
  );
END

返回