Error code
SQL Server 2601
SQL SERVER2601
Database Error Code· An error code returned by a database server such as PostgreSQL or MySQL.
What it means
cannot insert duplicate key row in object with unique index — index duplicate violation.
How to fix it
- Use MERGE or INSERT with IF NOT EXISTS to handle duplicates before they reach the index.
- Delete or update the conflicting existing row.
- Review application logic to avoid generating duplicate values for uniquely indexed columns.
Not affiliated with SQL Server. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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