[LeetCode]Nth Highest Salary,解题报告，leetcodenth

题目

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.

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思路

这道题目给了Employee表，要求找到第n高的工资数目是多少。

排序的问题我们可以使用order by和limit两个关键字来搞定。

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AC SQL

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