1、ROW_NUMBER()函数作用就是将SELECT查询到的数据进行排序，每一条数据加一个序号
SELECT
ROW_NUMBER() OVER (ORDER BY SCORE DESC) AS [RANK],*
FROM Scores;
SELECT * FROM (
SELECT ROW_NUMBER() OVER (ORDER BY SCORE DESC) AS [RANK],*
FROM Scores
) t WHERE t.RANK=2;
2、RANK()函数，顾名思义排名函数，可以对某一个字段进行排名
SELECT RANK() OVER (ORDER BY SCORE DESC) AS [RANK],*
FROM Scores;
3、DENSE_RANK()函数也是排名函数，和RANK()功能相似，也是对字段进行排名
SELECT
DENSE_RANK() OVER (ORDER BY SCORE DESC) AS [RANK],*
FROM Scores;
4、NTILE()函数是将有序分区中的行分发到指定数目的组中，各个组有编号，编号从1开始，就像我们说的'分区'一样 ，分为几个区，一个区会有多少个
SELECT NTILE(1) OVER (ORDER BY SCORE DESC) AS [RANK],* FROM Scores;
SELECT NTILE(2) OVER (ORDER BY SCORE DESC) AS [RANK],* FROM Scores;
SELECT NTILE(3) OVER (ORDER BY SCORE DESC) AS [RANK],* FROM Scores;