ROW_NUMBER (Transact-SQL)(摘自MSDN)

< partition_by_clause >

将 FROM [ http://msdn.microsoft.com/zh-cn/library/ms177634.aspx ] 子句生成的结果集划入应用了 ROW_NUMBER 函数的分区。若要了解 PARTITION BY 语法，请参阅 OVER 子句 (Transact-SQL) [ http://msdn.microsoft.com/zh-cn/library/ms189461.aspx ] 。

< order_by_clause >

确定将 ROW_NUMBER 值分配给分区中的行的顺序。有关详细信息，请参阅 ORDER BY 子句 (Transact-SQL) [ http://msdn.microsoft.com/zh-cn/library/ms188385.aspx ] 。当在排名函数中使用 <order_by_clause> 时，不能用整数表示列。

bigint

ORDER BY 子句可确定在特定分区中为行分配唯一 ROW_NUMBER 的顺序。

A. 返回销售人员的行号

                        SELECT FirstName, LastName, ROW_NUMBER() OVER(ORDER BY SalesYTD DESC) AS 'Row Number', SalesYTD, PostalCode 



FROM Sales.vSalesPerson



WHERE TerritoryName IS NOT NULL AND SalesYTD <> 0;
                      

B. 返回行的子集

                        USE AdventureWorks;

GO

WITH OrderedOrders AS

(

    SELECT SalesOrderID, OrderDate,

    ROW_NUMBER() OVER (ORDER BY OrderDate) AS 'RowNumber'

    FROM Sales.SalesOrderHeader 

) 

SELECT * 

FROM OrderedOrders 

WHERE RowNumber BETWEEN 50 AND 60;
                      

C. 将 ROW_NUMBER () 与 PARTITION 一起使用

                        SELECT FirstName, LastName, ROW_NUMBER() OVER(PARTITION BY PostalCode ORDER BY SalesYTD DESC) AS 'Row Number', SalesYTD, PostalCode 

FROM Sales.vSalesPerson

WHERE TerritoryName IS NOT NULL AND SalesYTD <> 0;
                      

参考

帮助和信息