Question

我是SQL Server新手并编写此查询：

SELECT  ROW_NUMBER() over (ORDER BY TelNo ) as RowNum,
        Telno  
FROM [ClubEatc].[dbo].[GetOnlineBills]
where RowNum=1

当我运行该查询时，我收到此错误：

Msg 207，Level 16，State 1，Line 11

无效的列名称'RowNum'。

我该如何解决？

谢谢大家。

Answer 1

以这种方式试试，

SELECT *
FROM ( SELECT ROW_NUMBER() over (ORDER BY TelNo ) as RowNum, Telno  
        FROM [ClubEatc].[dbo].[GetOnlineBills]
     ) AS tbl
WHERE RowNum=1

Answer 2

您无法在同一select语句中过滤排名函数结果。使用以下脚本。

with cte_1
as
(
SELECT ROW_NUMBER() over (ORDER BY TelNo ) as RowNum,Telno  FROM [ClubEatc].[dbo].[GetOnlineBills])
SELECT *
FROM cte_1
where RowNum=1

Answer 3

您收到此错误是因为您无法在WHERE语句中使用计算列别名，或者甚至放置where ROW_NUMBER() over (ORDER BY TelNo ) = 1因为它被禁止。

您需要使用CTE或子查询，只需使用TOP 1 WITH TIES按ROW_NUMBER()排序：

SELECT TOP 1 WITH TIES Telno  
FROM [ClubEatc].[dbo].[GetOnlineBills]
ORDER BY ROW_NUMBER() over (ORDER BY TelNo)

为什么我在sql server ROW_NUMBER（）中出错？

3 个答案: