SQL MERGE STATEMENT

This question is not very clear, can you please provide more context?

Generally speaking, the SQL MERGE statement, often referred to as an "upsert", is used to merge data from a source (like a table or view) into a target table based on a specified condition. It's a powerful tool that combines the functions of INSERT, UPDATE, and DELETE into a single, atomic statement. This makes it particularly useful for synchronizing two tables by inserting new records, updating existing records, or deleting records in the target table based on whether or not they match records in the source table.

Not all database or datawarehouse has this merge function, very often you have to create an upsert statements in 2 separate steps.