为 'PVT' 多次指定列“638”。枢

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 riy 和 eas 位置的预期 result.Giving 总数量。

但是，我想动态获取 Store 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

这给了我一个错误，说 为 'PVT'.[=13 多次指定了列 '638' =]

我该如何解决这个问题？

Answer 1

只需确保列是不同的

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

Answer 2

在不知道你的实际数据的情况下，这是一次盲目飞行，但我认为你有两个问题：

您必须使用 DISTINCT 来获取每个值一次
您连接的不是商店名称，而是您产品的 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 3

感谢@Shnugo 将我推向正确的方向。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

为 'PVT' 多次指定列“638”。枢

The column '638' was specified multiple times for 'PVT'. Pivot

sql

tsql

pivot-table

crosstab

sql-server-2008