題目3：MySQL----------Nth Highest Salary，salary

題目3：MySQL----------Nth Highest Salary，salary

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.

題目解答：

CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INTBEGINDECLARE 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