合并语句插入重复行？

Question

我一直在这上面花时间，但我似乎无法找到 MERGE 语句插入重复行的原因。这是我的 table。

TABLE <code>INVENTORY

ProductID  |   ProductName   |   ProductCode   |   Quantity   |   Location
1          |   Stabilo       |   Code123       |   3          |   Basement
2          |   Parker Pen    |   Code456       |   4          |   Basement

TABLE 收入库存</pre>

REQUESTNUMBER  |  ProductID    | ProductName  | ProductCode  | Quantity  | DeliveryLocation
Request123     |  2            | Parker Pen   | Code456      | 3         | Basement
Request123     |  3            | Eraser       | Code789      | 5         | Basement


一个请求号 = 多个项目，就像快餐外卖可以在一个交易号中包含多个订单。


当我 运行 这个查询...


MERGE INVENTORY as T1
USING INCOMINGSTOCKS AS T2
ON T1.ProductCode = T2.ProductCode
AND T2.REQUESTNUMBER = 'Request123' and T2.DeliveryLocation= 'Basement'
WHEN MATCHED THEN
UPDATE SET T1.Quantity = T1.Quantity + T2.Quantity
WHEN NOT MATCHED THEN
INSERT (ProductID, ProductName, ProductCode, Quantity, Location) 
VALUES (T2.ProductID, T2.ProductName, T2.ProductCode, T2.Quantity, T2.DeliveryLocation);




...它 returns 具有以下数据：


ProductID  | ProductName  |  ProductCode  |  Quantity  |  Location
Stabilo    | 1            |  Code123      |  3         |  Basement
Stabilo    | 1            |  Code123      |  3         |  Basement
Parker Pen | 2            |  Code456      |  7         |  Basement
Parker Pen | 2            |  Code456      |  4         |  Basement


"Eraser" 项甚至没有插入！它只复制了 Stabilo（它不在 INCOMINGSTOCKS table 中，添加了 Parker Pens (3+4) 的数量，这次又用它的初始数量重新插入了它。



拜托，有人可以帮助我吗？关于我的查询有任何见解或评论吗？有什么问题吗？


谢谢你！！！

Answer 1

有点不明白T2.DestinationLocation, T2.Location, USING INCOMING STOCKS AS T2

无论如何都这样尝试：

MERGE INVENTORY as T1
USING INCOMINGSTOCKS AS T2
ON T1.ProductCode = T2.ProductCode
and T2.REQUESTNUMBER = 'Request123' and T2.DeliveryLocation = 'Basement'
WHEN MATCHED THEN
UPDATE SET T1.Quantity = T1.Quantity + T2.Quantity
WHEN NOT MATCHED THEN
INSERT (ProductID, ProductName, ProductCode, Quantity, Location) 
VALUES (T2.ProductID, T2.ProductName, T2.ProductCode, T2.Quantity, T2.DeliveryLocation);

select * from INVENTORY

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