行使 MERGE 在单个语句中对表执行 UPDATE 和 DELETE 操纵

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USE AdventureWorks2012;
GO
IF OBJECT_ID (N'Production.usp_UpdateInventory',N'P') IS NOT NULL DROP PROCEDURE Production.usp_UpdateInventory;
GO
CREATE PROCEDURE Production.usp_UpdateInventory
    @OrderDate datetime
AS
MERGE Production.ProductInventory AS target
USING (SELECT ProductID,SUM(OrderQty) FROM Sales.SalesOrderDetail AS sod
    JOIN Sales.SalesOrderHeader AS soh
    ON sod.SalesOrderID = soh.SalesOrderID
    AND soh.OrderDate = @OrderDate
    GROUP BY ProductID) AS source (ProductID,OrderQty)
ON (target.ProductID = source.ProductID)
WHEN MATCHED AND target.Quantity - source.OrderQty <= 0
    THEN DELETE
WHEN MATCHED 
    THEN UPDATE SET target.Quantity = target.Quantity - source.OrderQty,target.ModifiedDate = GETDATE()
OUTPUT $action,Inserted.ProductID,Inserted.Quantity,Inserted.ModifiedDate,Deleted.ProductID,Deleted.Quantity,Deleted.ModifiedDate;
GO

EXECUTE Production.usp_UpdateInventory '20030501'

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