SQL RANK、DENSE_RANK、NTILE

现有数据如下：

1 SELECT 
2     *, 
3     ROW_NUMBER() OVER (ORDER BY 科目) AS 'Row Number', 
4     RANK() OVER (ORDER BY 科目) AS 'Rank',
5     DENSE_RANK() OVER (ORDER BY 科目) AS 'Dense Rank',
6     NTILE(4) OVER (ORDER BY 科目) 'NTILE'
7  FROM Table_A

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