在where子句中使用ranking-function派生列(SQL Server 2008)

Question

希望这对于SQL-Ninja来说是微不足道的......试图让以下查询工作:

这适用于SQL Server 2008

SELECT 
    ROW_NUMBER() OVER (ORDER BY Date_Time DESC) AS RowNumber, *
FROM
    (SELECT 
         T.A_ID, T.User_Name, T.Date_Time, T.Value,
         U.ID, U.Name, U.Field1, U.Field2,
         COUNT(U.ID) OVER () AS TotalRows
     FROM 
        TeeTable as T 
    INNER JOIN 
        YouTable AS U ON T.U_ID = U.ID
    WHERE 
        T.Value BETWEEN 222 AND 225) Filtered
WHERE 
    RowNumber BETWEEN 1 AND 5

这些值在某种程度上是为了给出一个具体的例子而设计的,但是查询的精神被完全保留了下来.我从这个陈述中得到的错误是:

列名称'RowNumber'无效.

如果我删除最后的WHERE子句(RowNumber BETWEEN ...),它返回一个预期的结果集(A_ID,User_Name,Date_Time等...),在所述结果中RowNumber为一列(具有敏感值).但我无法在WHERE子句中与它进行比较.我显然做了一些愚蠢的事情,但这达到了我的SQL限制!

我已经尝试将其重新安排为CTE,(WITH Filtered AS ...)但最终结果是一样的,看来这只是我已经在做的糖.

想法？如何过滤RowNumber派生列？

Answer 1

您必须将WHERE运算符移动到创建RowNumber列的项目列表上方.使用派生表或CTE:

SELECT * 
  FROM (
   SELECT *, ROW_NUMBER() OVER (...) as RowNumber
   FROM ...) As ...
 WHERE RowNumber = ...

等效的CTE是:

WITH cte AS (
SELECT *, ROW_NUMBER() OVER (...) as RowNumber
       FROM ...)
SELECT * FROM cte 
WHERE RowNumber = ...   

Answer 2

窗口函数(其中ROW_NUMBER是最熟悉的)在查询的最后阶段填充,远在WHERE子句之后.因此,您也必须将其嵌套,以便对其进行过滤:

SELECT *
FROM (
    SELECT ROW_NUMBER() OVER (ORDER BY Date_Time DESC) AS RowNumber, *
    FROM
    ( SELECT T.A_ID, T.User_Name, T.Date_Time, T.Value,
             U.ID, U.Name, U.Field1, U.Field2,
             COUNT(U.ID) OVER () AS TotalRows
      FROM 
        TeeTable as T INNER JOIN YouTable AS U
        ON T.U_ID = U.ID
        WHERE T.Value BETWEEN 222 AND 225
    ) Numbered
)  Filtered
WHERE RowNumber BETWEEN 1 AND 5

您也可以将它们放在CTE或视图中以获得相同的效果.