Question

我有以下SQL查询

Select Product_Id, [riy] AS [riy],
  [eas] AS [eas]
  FROM
  (SELECT Product_Id, Store_Name, Quantity
  FROM [Product_Stock]  INNER JOIN Store on Store.Id = [Product_Stock].Stock_Id where Product_Id = 435) ps
  PIVOT
  (
  SUM(Quantity)
  FOR Store_Name IN
  ([riy],[EAST WAREHOUSE - eas])
  ) AS pvt

它给出了预期的结果。给我位置riy和eas的总数量。

但是，我想动态获取商店名称，而不是手动指定它们。

这就是我所做的。

DECLARE @cols AS NVARCHAR(MAX),
@query  AS NVARCHAR(MAX)

SELECT @cols = STUFF((SELECT  ',' + QUOTENAME([Product_Id]) 
                    FROM [Product_Stock]
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

SELECT @query = 
'SELECT Product_Id FROM
(SELECT Product_Id, Store_Name, Quantity
  FROM [Product_Stock]  INNER JOIN Store on Store.Id = [Product_Stock].Stock_Id where Product_Id = 435) PS
PIVOT 
(
    SUM(Quantity)
    FOR Store_Name in (' + @cols + ')
) AS PVT'

EXEC SP_EXECUTESQL @query

这给我一个错误说 'PVT'多次指定了'638'列。

我该如何解决这个问题？

Answer 1

在不知道您的实际数据的情况下，这是一次盲目飞行，但我认为您有两个问题：

您必须使用DISTINCT才能获得每个值
您不是连接商店名称，而是连接商品的ID

试试这个

SELECT @cols = STUFF((SELECT DISTINCT  ',' + QUOTENAME([Store_Name]) 
                FROM [Product_Stock]
                INNER JOIN Store on Store.Id = [Product_Stock].Stock_Id
        FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')

Answer 2

确保cols是DISTINCT

... STUFF((SELECT DISTINCT  ','...

Answer 3

感谢@Shnugo推动我朝着正确的方向前进。这是我最终使用的查询。

DECLARE @cols AS NVARCHAR(MAX),
@query  AS NVARCHAR(MAX)

SELECT @cols = STUFF((SELECT DISTINCT ',' + QUOTENAME([Store].Store_Name) 
                    FROM [Store] INNER JOIN Product_Stock ON Product_Stock.Stock_Id = Store.Id
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

SELECT @query = 
'SELECT Product_Id , ' + @cols + ' from
(SELECT Product_Id, Store_Name, Quantity
  FROM [Product_Stock]  INNER JOIN Store on Store.Id = [Product_Stock].Stock_Id WHERE Product_Stock.product_id = 435 ) PS
PIVOT 
(
    SUM(Quantity)
    FOR Store_Name in (' + @cols + ')
) AS PVT'

EXEC SP_EXECUTESQL @query

'PVT'多次指定了列'638'。枢

3 个答案: