Web Reference: May 9, 2024 · The MERGE statement compares data between a source table and a target table based on specified key fields. It performs appropriate actions like inserting new records, updating existing ones, and deleting or flagging records no longer present in the source. Jan 29, 2026 · The MERGE statement runs insert, update, or delete operations on a target table from the results of a join with a source table. For example, synchronize two tables by inserting, updating, or deleting rows in one table based on differences found in the other table. In a typical SQL Data warehouse solution, it is often essential to maintain a history of data in the warehouse with a reference to the source data that is being fed to the ETL tool. A most common use case is while trying to maintain Slowly Changing Dimensions (SCD) in the data warehouse. In such cases, you need to insert new records into the data w...
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