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这篇文章介绍SQL中4个很有意思的函数,我称它的行标函数,它们是row_number,rank,dense_rank和ntile,下面分别进行介绍。

一  row_number:它为数据表加一个叫“行标示”的列,它在数据表中是连续的,我们必须按着某个顺序把表排序之后,才能使用row_number,看下列例子:

SELECT   row_number() OVER ( ORDER BY SalePrice ) AS row ,
*
FROM Product

结果表被加上了行号:

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" 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这个row_number在平常用的最多,它可以用来实现数据表的分页功能,看下面代码

 SELECT *
FROM ( SELECT row_number() OVER ( ORDER BY SalePrice ) AS row ,
*
FROM Product
) AS Result
WHERE Result.row BETWEEN 1 AND 2

它的含义是从第一条记录开始,取出2条记录,如果你想一页显示10条记录,可以使用BETWEEN 1 AND 10,如果想得到第二次的10条,那条件就变成BETWEEN 11 AND 20

二   rank:类型于row_number,不同之处在于,它会对order by 的字段进行处理,如果这个字段值相同,那么,行号保持不变,如代码:

 SELECT RANK() OVER ( ORDER BY SalePrice ) AS row ,
SalePrice ,
ProductID ,
ProductName
FROM Product

结果如下:

aaarticlea/png;base64,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" alt="" />

三   dense_rank:与rank类型,不同之处在于行号是否保留一个位置,rank对保留这个位置,即上面图中,row的值由1直接变为3,因为它的1出现了两次,所以为2保留了一个位置,而dense_rank不会保留2这个位置,即实现的行号2其实是排在了第3位,如代码:

 SELECT DENSE_RANK() OVER ( ORDER BY SalePrice ) AS row ,
SalePrice ,
ProductID ,
ProductName
FROM Product

结果如下:

aaarticlea/png;base64,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" alt="" />

四   ntile:为装桶操作,ntile(桶数)它在运行之前,先确定产生的桶数,然后根据桶数去生成行标,如代码:

 SELECT NTILE(1) OVER ( ORDER BY SalePrice ) AS ntile ,
SalePrice ,
ProductID ,
ProductName
FROM Product

结果如下:

aaarticlea/png;base64,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" alt="" />

如果设为NTILE(3),那结果就为:

aaarticlea/png;base64,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" alt="" />

当我们面对一个复杂的问题时,考验的不是你是否能解决,而是你采取哪种方式去解决以及代码的性能问题。

回到目录

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