As you can see, there are two circles that represent two tables and can be considered as Source and a Target. The above illustration depicts how a SQL MERGE statement basically works. The MERGE statement basically modifies an existing table based on the result of comparison between the key fields with another table in the context. Using the MERGE statement in SQL gives you better flexibility in customizing your complex SQL scripts and also enhances the readability of your scripts. You can specify conditions on which you expect the MERGE statement to insert, update, or delete, etc. MERGE statement in SQL is a very popular clause that can handle inserts, updates, and deletes all in a single transaction without having to write separate logic for each of these. In this article, I am going to give a detailed explanation of how to use the SQL MERGE statement in SQL Server.
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