A SQL MERGE statement performs actions based on a RIGHT JOIN

The post explains how the SQL MERGE statement operates based on a RIGHT JOIN between target and source tables. It describes the use of MERGE for performing INSERT, UPDATE, and DELETE operations depending on whether rows in the target table match those in the source table. The MERGE statement is particularly useful in ETL (Extract, Transform, Load) jobs for updating or inserting rows based on matching conditions. Additionally, it covers the extension of the MERGE statement with clauses like NOT MATCHED BY SOURCE and NOT MATCHED BY TARGET, which enhances its functionality.