MERGE

MERGE is a database operation used to synchronize data between two sources, typically a target table and a source dataset. It allows you to update existing records, insert new records, or delete records based on specific matching criteria, all in a single command. Think of it as a way to efficiently keep data consistent: if the data exists, update it; if not, add it; and if needed, remove outdated information. MERGE streamlines data management by combining what would usually require multiple steps into one, making processes more efficient and reducing errors.