使用派生列的SQL排名函数

Question

我想在派生列排序的查询上使用SQL Server 2008的排名函数。这里有一个例子

SELECT 
    table.FirstName, table.LastName, 
    CalculatedValue(table.number) As Points, 
    ROW_NUMBER() OVER (ORDER BY points) AS 'Row Number' 
FROM table 
ORDER BY points 

我总是得到一个错误无效列名“点”因为OVER功能不与别名的基础上，我读过工作。

有谁知道一个替代方案，我可以检索按派生列排序的结果集的顺序行号？

Answer 1

如何使用派生表（子查询）？我认为类似下面的内容应该可以工作

SELECT 
    ROW_NUMBER() OVER (ORDER BY sub.Points) AS 'Row Number', 
    sub.FirstName, 
    sub.LastName, 
    sub.Points 
FROM 
(

    SELECT 
     table.FirstName, 
     table.LastName, 
     CalculatedValue(table.number) As Points 
    FROM 
     table  
) sub 
ORDER BY 
    sub.Points 

Answer 2

使用CTE来计算您的点数，然后在CTE上进行排名。

WITH tableWithPoints AS (
    SELECT 
     table.FirstName, table.LastName, 
     CalculatedValue(table.number) As Points 
    FROM table) 

SELECT FirstName, LastName, Points, 
    ROW_NUMBER() OVER (ORDER BY Points) AS 'Row Number' 
FROM 
    tableWithPoints ORDER BY Points