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一、row_number()

row_number()排名，序号连续且不重复，即使表中遇到有一样的数值也是如此.

select score,row_number() OVER(order by score desc) as paiming from Scores;

二、rank()

row_number()排名，序号可以重复，但不连续，要求把排序的数值相同的归为一组且序号相同

select score,rank() OVER(order by score desc) as paiming from Scores;

三、dense_rank()

Dense_rank() 排序是连续的，也会把相同的值分为一组且每组排序号一样

select score,dense_rank() OVER(order by score desc) as paiming from Scores;

四、ntile()
Ntile(group_num)将表分为group_num个组，每组序号都一样。

select score,ntile(3) OVER(order by score desc) as paiming from Scores;