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In SQL Server 2008, Microsoft introduces the MERGE functionality through the MERGE command. The MERGE command inserts rows that don’t exist and updates the rows that do exist.
What MERGE Command works as,
Until now, this MERGE functionality could only be made available in SQL Server through stored procedures and cursors, etc.
This article illustrates how to user MERGE command in SQL Server 2008.
Suppose we have 2 tables with same field structure as ID, ProductName and SKU,
MERGE INTO ProductTable1 AS Target
USING AS ProductTable2 AS Source
ON Target.ID = Source.ID
WHEN MATCHED THEN
UPDATE SET Target.ProductName = Source.ProductName,
Target.SKU = Source.SKU
WHEN NOT MATCHED THEN
INSERT (ID,ProductName,SKU) VALUES (Source.ID,Source.ProductName,Source.SKU);