SQL将多行合并为多列

Question

我一直在这里和整个网络中查看另一个示例，但我只是不能全神贯注于如何执行此操作。

我有一个网站，我在其中将有关产品的每条信息拉到一张表中进行查看，然后加载到csv / excel工作表中。

它合并了7个表，并按以下方式将它们吐出：（剪掉表的其余部分以使其易于阅读）

ID  Filter     FilterValue  ParentItem  ItemTitle             
---------------------------------------------------------------
7   15         B            LE0001      LB PALETTE WHITE 127MM
7   16         Yes          LE0001      LB PALETTE WHITE 127MM  
7   18         Yes          LE0001      LB PALETTE WHITE 127MM
7   20         Std          LE0001      LB PALETTE WHITE 127MM
7   22         Yes          LE0001      LB PALETTE WHITE 127MM
7   23         Polyester    LE0001      LB PALETTE WHITE 127MM
7   25         White        LE0001      LB PALETTE WHITE 127MM
7   26         127mm        LE0001      LB PALETTE WHITE 127MM

使用此代码（显示的当前列是tblprod.prodID，prodval.valueColumn，prodval.valueKey，tblprod.parentSKU和tblprod.prodTitle）

SELECT 
   tblprod.prodID as ID, prodval.valueColumn as Filter, 
   prodval.valueKey as FilterValue, tblprod.prodSKU as Item, 
   tblprod.parentSKU as ParentItem, tblprod.prodTitle as ItemTitle, 
   tblprod.prodConsumerTitle as ConsumerTitle, tblprod.itemGroup as ItemGroup, 
   tblprod.itemFamily as ItemFamily, tblprod.cutLengthCode as LengthCode, 
   tblprod.prodPackSize as PackSize, tblprod.prodMultQty as MultipleQuantity, 
   tblsu.ImportCode as SalesUnit, tblprod.prodPrice as SalesPrice , 
   tblprod.qtyDependent as QtyDep, tblprod.qtyTarget as Limit, 
   tblprod.targetPrice as Price, tblprod.prodLegacyImage as MainImage,
   catprod.IsPrimary as SafetyinMind, featlists.prodList as NEWLimited      
FROM 
   [Eclipse].[dbo].[tbl_Product] AS tblprod
LEFT JOIN 
   [Database].[dbo].[tbl_SalesUnit] AS tblsu ON tblsu.ID = tblprod.saleUnit
LEFT JOIN 
   [Database].[dbo].[tbl_ProductFilter] AS prodfil ON prodfil.ProdID = tblprod.prodID
LEFT JOIN 
   [Database].[dbo].[tbl_ProductFilterValues] AS prodval ON prodval.valueID = prodfil.valueID
LEFT JOIN
   [Database].[dbo].[tbl_ProductstoFeaturedLists] AS prodlists ON prodlists.prodID = tblprod.prodID
LEFT JOIN
   [Database].[dbo].[tbl_FeaturedLists] AS featlists ON featlists.ID = prodlists.listID
LEFT JOIN 
   [Database].[dbo].[tbl_CategoryProducts] AS catprod ON catprod.prodID = tblprod.prodID

重要的部分是我想合并相同ID的行，从Filter列（prodval.valueColumn）中创建列标题，并用其对应的值（prodval.valueKey）填充它们

我的问题是我只是不知道如何完成此操作，在阅读其他答案时我迷失了；其次，有19个过滤器，并不是每个产品都具有全部过滤器（如您所见，上述产品有8个），我不确定如果这样做会导致我遇到任何问题。 过滤器的范围从15到33，所有过滤器都可以使用，但只能用于不同的产品。

表格示例如下所示。

ID  ParentItem  ItemTitle               Filter 15   Filter 16   Filter 17   Filter 18   Filter 19   Filter 20   Filter...
7   LE0001      LB PALETTE WHITE 127MM  B           YES                     YES                     Std 

如果有人能提供任何帮助，我将不胜感激，我将无能为力。

抱歉忘了提及我正在使用SQL Server Management Studio

Answer 1

请尝试以下解决方案：

DECLARE @Columns VARCHAR(max)
;WITH cte
     AS (SELECT Min(Filter) minimum,
                Max(Filter) maximum
         FROM   yourtable)
SELECT @Columns = Stuff((SELECT ',' + '[ ' + CONVERT(VARCHAR(30), number, 121) + ']'
                         FROM   master..spt_values N
                         WHERE  EXISTS (SELECT 1
                                        FROM   cte
                                        WHERE  n.number BETWEEN cte.minimum AND cte.maximum)
                                AND type = 'P'
                         FOR XML PATH('')), 1, 1, '')

DECLARE @sql NVARCHAR(max)= 'select [ID],[ParentItem],[ItemTitle],' + @Columns + 
                            ' from (select [ID],[ParentItem],[ItemTitle],[Filter],[FilterValue] from yourtable) t 
                            pivot
                            (MAx(FilterValue)
                            FOR Filter in(' + @Columns + ')
                            )as pvt'

EXEC sp_executesql
  @sql 

sqlfiddle

Answer 2

使用PIVOT获得结果。 提琴手演示

CREATE TABLE #Sample
(
    ID INT,  
    Filter INT,    
    FilterValue VARCHAR(100),  
    ParentItem VARCHAR(100),  
    ItemTitle VARCHAR(100)
)

INSERT INTO #Sample VALUES(7,   15,'B',   'LE0001','LB PALETTE WHITE 127MM')
INSERT INTO #Sample VALUES(7,   16,'Yes', 'LE0001','LB PALETTE WHITE 127MM')  
INSERT INTO #Sample VALUES(7,   18,'Yes', 'LE0001','LB PALETTE WHITE 127MM')
INSERT INTO #Sample VALUES(7,   20,'Std', 'LE0001','LB PALETTE WHITE 127MM')
INSERT INTO #Sample VALUES(7,   22,'Yes', 'LE0001','LB PALETTE WHITE 127MM')
INSERT INTO #Sample VALUES(7,   23,'Polyester',    'LE0001','LB PALETTE WHITE 127MM')
INSERT INTO #Sample VALUES(7,   25,'White','LE0001','LB PALETTE WHITE 127MM')
INSERT INTO #Sample VALUES(7,   26,'127mm','LE0001','LB PALETTE WHITE 127MM')


SELECT P.ID,P.ParentItem, P.ItemTitle, 
 Min(Filter15) Filter15,
 Min(Filter16) Filter16 ,
 Min(Filter17)Filter17,
 Min(Filter18)Filter18,
 Min(Filter19)Filter19,
 Min(Filter20)Filter20,
 Min(Filter21)Filter21,
 Min(Filter22)Filter22,
Min(Filter23)Filter23,
Min(Filter24)Filter24,
Min(Filter25)Filter25,
Min(Filter26)Filter26,
Min(Filter27)Filter27,
Min(Filter28)Filter28,
Min(Filter29)Filter29,
Min(Filter30)Filter30,
Min(Filter31)Filter31,
Min(Filter32)Filter32,
Min(Filter33)Filter33
FROM 
 (SELECT *,
               'Filter' + CONVERT(VARCHAR(30), Filter)  AS Filter_A

        FROM   #Sample
 ) AS A

 PIVOT (Min(A.FilterValue) FOR Filter_A in 
      (Filter15,Filter16,Filter17,Filter18,Filter19,
       Filter20,Filter21,Filter22,Filter23,Filter24,
       Filter25,Filter26,Filter27,Filter28,Filter29,
       Filter30,Filter31,Filter32,Filter33)) AS P
GROUP BY P.ID,P.ParentItem, P.ItemTitle