Sql server 子查询在更新无效时返回了1个以上的值

我正在尝试使用另一个表中每个项目的数量总和来更新SQL Server表

这是我的第一次尝试：

UPDATE InventoryMaster
SET TemporaryStock = ((SELECT coalesce(SUM(Quantity), 0) AS Total
                       FROM InventoryTransTemp
                       WHERE CustomerID = '0'
                       GROUP BY InventoryItemID) -
                      (SELECT COALESCE(SUM(Quantity), 0) AS Total
                       FROM InventoryTransTemp
                       WHERE CustomerID > 0
                       GROUP BY InventoryItemID))

下面是我使用join的第二个示例

UPDATE a 
SET a.TemporaryStock =((SELECT COALESCE(SUM(Quantity), 0) AS Total 
                        FROM InventoryTransTemp 
                        WHERE CustomerID = '0' 
                        GROUP BY InventoryItemID) - 
                       (SELECT COALESCE(SUM(Quantity), 0) AS Total 
                        FROM InventoryTransTemp  
                        WHERE CustomerID > 0 
                        GROUP BY InventoryItemID)) 
FROM InventoryMaster a 
INNER JOIN InventoryTransTemp b on a.InventoryItemID = b.InventoryItemID 

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在这两种情况下，我都会得到相同的错误，我想这就是您在这里要做的。子查询的目的是计算每个库存项目的临时库存金额。我们可以将子查询移动到CTE中，然后更新join主表

WITH cte AS (
    SELECT
        InventoryItemID,
        COALESCE(SUM(CASE WHEN CustomerID = 0 THEN Quantity ELSE 0 END) -
                 SUM(CASE WHEN CustomerID > 0 THEN Quantity ELSE 0 END), 0) AS Total
    FROM InventoryTransTemp
    GROUP BY InventoryItemID
)

UPDATE a
SET TemporaryStock = b.Total
FROM InventoryMaster a
INNER JOIN cte b
    ON a.InventoryItemID = b.InventoryItemID;

---

请注意，主表中的inventory ID join列的名称不清楚。我假设它与临时表中的名称相同。

谢谢，先生，它工作得很好！但是如果我希望我的结果超过这两个查询呢？我需要再添加一个示例：选择InventoryItemID，CustomerID=0时合并SUMCASE，然后选择Quantity ELSE 0 END-CustomerID>0时合并SUMCASE，然后选择Quantity ELSE 0 END，按照InventoryItemID+选择InventoryItemID从InventoryTransTemp组中总计0，当CustomerID=0时合并SUMCASE，然后数量ELSE 0 END-当CustomerID>0时合并SUMCASE，然后数量ELSE 0 END，按InventoryItemId从另一个表组中总计0，但没有看到数据，我无法真正进行注释。添加另一个条件和不应中断查询。