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Why does this SQL MERGE overwrite when it should not?

Why does this SQL MERGE overwrite when it should not. The SQL code uses MERGE with a WHEN MATCHED that always runs. In SQL the logic can overwrite rows you intended to skip. In SQL sync jobs this corrupts data.

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https://www.youtube.com/watch?v=FzZuQz1s4oE

Why does this SQL MERGE overwrite when it should not? #sqloverwrite

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Tutorial Gateway Jun 13, 2025

🚀 Boost Your SQL Game with MERGE! Looking to streamline your database operations? The SQL MERGE statement is a powerful tool that lets you INSERT, UPDATE, or DELETE data in a single, efficient command. 💡 Whether you're syncing tables, managing data warehouses, or simplifying ETL processes — MERGE can save you time and reduce complexity.
 🔹 What SQL MERGE is 🔹 Real-world use cases 
https://www.tutorialgateway.org/sql-merge-statement/
#SQLServer #DatabaseTips #DataEngineering #SQLMerge #ETL #CodingTips

SQL MERGE Statement

Merge in SQL Server performs INSERT, DELETE, & UPDATE in single statement. SQL MERGE Statement modify target data based on source table data.

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