将多行的列值作为链接项的列返回

Question

我有一个（简化的）表，其结构如下：

Table: ItemData

PK | ScanCode | StoreFK | Retail | ReceiptAlias
1  | 100101   | 1       | 4.99   | Milk
4  | 100101   | 2       | 4.99   | Milk
7  | 100101   | 3       | 0.99   | Milk
2  | 100102   | 1       | 6.99   | Eggs
5  | 100102   | 2       | 6.99   | Eggs
8  | 100102   | 3       | 6.99   | Eggs
3  | 100103   | 1       | 7.99   | Bread
6  | 100103   | 2       | 8.99   | Bread
9  | 100103   | 3       | 9.99   | Bread

我可以使用以下SQL查询来获取以下返回结果，该结果显示在一个或多个商店中具有不同零售的所有商品：see this previously asked question

SQL查询：

SELECT   im.INV_ScanCode     AS ScanCode,
         name.ItemData AS im
GROUP BY ScanCode, Receipt_Alias
HAVING   COUNT(DISTINCT im.Retail) > 1
ORDER BY ScanCode

当前返回结果：

ScanCode | Receipt_Alias 
100101   | Milk
100103   | Bread

我想在一个或多个商店退回所有零售店铺的商品 AND 在每个商店位置的零售商店：

所需的退货结果：

ScanCode | Receipt_Alias | Str_1 | Str_2 | Str_3
100101   | Milk          | 4.99  | 4.99  | 0.99
100103   | Bread         | 7.99  | 8.99  | 9.99

如何更改我的SQL查询以在每个商店位置包含零售？

Answer 1

SELECT  ScanCode as ItemID,
        ReceiptAlias,
        MAX(CASE WHEN StoreFK = 1 THEN Retail ELSE NULL END) Store_1,
        MAX(CASE WHEN StoreFK = 2 THEN Retail ELSE NULL END) Store_2,
        MAX(CASE WHEN StoreFK = 3 THEN Retail ELSE NULL END) Store_3
FROM    ItemData
GROUP   BY ScanCode, ReceiptAlias
HAVING  COUNT(DISTINCT Retail) > 1

• SQLFiddle Demo