0177._Nth_Highest_Salary.md

177. Nth Highest Salary

难度: Medium

刷题内容

原题连接

• https://leetcode.com/problems/two-sum

内容描述

Write a SQL query to get the nth highest salary from the Employee table.

+----+--------+
| Id | Salary |
+----+--------+
| 1  | 100    |
| 2  | 200    |
| 3  | 300    |
+----+--------+
For example, given the above Employee table, the nth highest salary where n = 2 is 200. If there is no nth highest salary, then the query should return null.

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

解题方案

思路 1

CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
set N = N - 1;
  RETURN (
      # Write your MySQL query statement below.
      select distinct Salary from Employee order by Salary desc limit N, 1
  );
END