Upsert Operation in SQL Server

Upsert in SQL Server is a powerful operation that combines the functionalities of both the INSERT and UPDATE commands to efficiently manage data. It allows you to either insert new records or update existing ones based on whether a matching record is found. This operation is particularly useful in scenarios like data synchronization, logging systems, and batch processing, where you need to ensure that the data is incrementally updated or inserted without unnecessary duplication.

In SQL Server, there are two primary ways to perform an upsert operation: using the MERGE statement or the IF-ELSE logic. The MERGE statement allows you to match records from a source table to a target table and either update or insert records based on specific conditions. Alternatively, the IF-ELSE method checks for the existence of a record and updates it if it exists, or inserts a new one if it doesn’t. Both methods help streamline data handling, ensuring that databases remain accurate and up-to-date with minimal effort.

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