LeetCode 177. Nth Highest Salary

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原文链接：http://www.cnblogs.com/pegasus923/p/7654583.html

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#数据库

本文介绍了一种使用SQL查询获取指定排名薪资的方法。通过创建函数getNthHighestSalary，可以返回Employee表中第N高的薪资。如果不存在该排名的薪资，则返回空值。

https://leetcode.com/problems/nth-highest-salary/description/

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

 1 Create table If Not Exists Employee (Id int, Salary int);
 2 Truncate table Employee;
 3 insert into Employee (Id, Salary) values ('1', '100');
 4 insert into Employee (Id, Salary) values ('2', '200');
 5 insert into Employee (Id, Salary) values ('3', '300');
 6 
 7 CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
 8 BEGIN
 9 DECLARE M INT;
10 SET M = N - 1;
11   RETURN (
12       # Write your MySQL query statement below.
13       SELECT
14         (SELECT Salary
15         FROM Employee
16         ORDER BY Salary DESC
17         LIMIT M, 1) AS getNthHighestSalary      
18   );
19 END