sql返回表中薪资第2/第N高数据

176. Second Highest Salary

Easy

要求：返回表中薪资第二高数据

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

+----+--------+
| Id | Salary |
+----+--------+
| 1  | 100    |
| 2  | 200    |
| 3  | 300    |
+----+--------+

For example, given the above Employee table, the query should return 200 as the second highest salary. If there is no second highest salary, then the query should return null.

+---------------------+
| SecondHighestSalary |
+---------------------+
| 200                 |
+---------------------+

select (
select distinct Salary
from
Employee
order by Salary desc limit 1,1) as 'SecondHighestSalary'

 

 

 177. 

要求：返回表中薪资第N高数据 （与上方方法相似，但是需要注意索引是从0开始，所以要将set N = (N-1); 

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 N,1 )as 'getNthHighestSalary'

);
END