SQL數據透視問題

Question

如果你可以請這個幫忙。該代碼會生成一個錯誤： Msg 8156，級別16，狀態1，行236 對'piv1'多次指定了'Classification_Value_Id'列。

我在SQL Server上這樣做。代碼步驟如下： 1.將源數據庫中的數據取消轉移[dbo]。[分類]合成一列 2.將此未轉移數據加入名爲DB.dbo [Classification_Value]的表中返回/加列「cv.Classification_Name」的數據集 3樞軸此數據集（這是返回錯誤的部分）

CODE：

SELECT 
     activityCode 
    , actjvPartnerRef 
    , actMonth 
    , actSalesChannel 
    , addCBPCharge 
    , agentId 
    , appType 
    , areaCode 

--SELECT 
--polRef,[Arrangement_Id],UnpivotedData.Classification_Value_Id,UnpivotedData.Classification_Scheme_Id,ColValues, ColNames,cv.Classification_Name 

FROM 
(
    SELECT top 10 
      [polRef] 
     , [Arrangement_Id] 
     , [Classification_Scheme_Id] 
     , [Classification_Value_Id] 
     -- ,[Arrangement_Classification_Type_Id] 
     -- ,[Effective_TimeStamp] 
     -- ,[End_date] 
     , CAST((ISNULL([character_measure],'')) AS NVARCHAR(MAX)) AS character_measure 
     , CAST((ISNULL([datetime_measure],'')) AS NVARCHAR(MAX)) AS datetime_measure 
     , CAST([decimal_measure] AS NVARCHAR(MAX)) AS decimal_measure 
     , CAST((ISNULL([integer_measure],'')) AS NVARCHAR(MAX)) AS integer_measure 
     , CAST((ISNULL([logical_measure],'')) AS NVARCHAR(MAX)) AS logical_measure 
     , CAST((ISNULL([charmax_measure],'')) AS NVARCHAR(MAX)) AS charmax_measure 
     , CAST((ISNULL([long_measure],'')) AS NVARCHAR(MAX)) AS long_measure 
     FROM DB.[dbo].[Classification] 
) AS SrcDataConverted 

UNPIVOT 
(
ColValues FOR ColNames IN 
(
    character_measure 
    , datetime_measure 
    , decimal_measure 
    , integer_measure 
    , logical_measure 
    , charmax_measure 
    , long_measure 
) 
) AS UnpivotedData 

LEFT JOIN DB.dbo.[Classification_Value] cv 
ON cv.[Classification_Scheme_Id] = UnpivotedData.[Classification_Scheme_Id] 
AND cv.Classification_Value_Id = UnpivotedData.Classification_Value_Id 

PIVOT 
(MAX(ColValues) for Classification_Name in (
    activityCode 
    , actjvPartnerRef 
    , actMonth 
    , actSalesChannel 
    , addCBPCharge 
    , agentId 
    , appType 
    , areaCode 
)) AS piv1; 

任何幫助將不勝感激

謝謝

Answer 1

StuarLC： 其他派生表需要在開始重新PIVOT之前包裝UNPIVOT的結果，因爲連接引入了重複的Classification_Value_Id和Classification_Scheme_id，這是連接所需的。

select 
     activityCode 
    , actjvPartnerRef 
    , actMonth 
    , actSalesChannel 
    , addCBPCharge 
    , agentId 
    , appType 
    , areaCode 
from (
    SELECT polRef 
     , [Arrangement_Id] 
     , UnpivotedData.Classification_Value_Id 
     , UnpivotedData.Classification_Scheme_Id 
     , ColValues 
     , ColNames 
     , Classification_Name 
    FROM (
     SELECT [polRef] 
      , [Arrangement_Id] 
      , [Classification_Scheme_Id] 
      , [Classification_Value_Id] 
      , CAST((ISNULL([character_measure],'')) AS NVARCHAR(MAX)) AS character_measure 
      , CAST((ISNULL([datetime_measure],'')) AS NVARCHAR(MAX)) AS datetime_measure 
      , CAST([decimal_measure] AS NVARCHAR(MAX)) AS decimal_measure 
      , CAST((ISNULL([integer_measure],'')) AS NVARCHAR(MAX)) AS integer_measure 
      , CAST((ISNULL([logical_measure],'')) AS NVARCHAR(MAX)) AS logical_measure 
      , CAST((ISNULL([charmax_measure],'')) AS NVARCHAR(MAX)) AS charmax_measure 
      , CAST((ISNULL([long_measure],'')) AS NVARCHAR(MAX)) AS long_measure 
      FROM DB.[dbo].[Classification] 
    ) AS SrcDataConverted 
    UNPIVOT 
    (
     ColValues FOR ColNames IN 
     (
      character_measure 
      , datetime_measure 
      , decimal_measure 
      , integer_measure 
      , logical_measure 
      , charmax_measure 
      , long_measure 
     ) 
    ) AS UnpivotedData 
    LEFT JOIN 
     DB.dbo.[Classification_Value] cv 
    ON cv.[Classification_Scheme_Id] = UnpivotedData.[Classification_Scheme_Id] 
    AND cv.Classification_Value_Id = UnpivotedData.Classification_Value_Id 
) as src 
PIVOT 
( 
    MAX(ColValues) for Classification_Name in (
      activityCode 
      , actjvPartnerRef 
      , actMonth 
      , actSalesChannel 
      , addCBPCharge 
      , agentId 
      , appType 
      , areaCode 
    ) 
) AS piv1;