Using the OUTPUT Clause with OLE DB in SQL Server Native Client
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
If you use an OUTPUT clause in an INSERT, UPDATE, DELETE, or MERGE command, the count of affected rows is not available. The application must count the number of rows in the rowset that is returned by the OUTPUT clause.
See Also
Creating a SQL Server Native Client OLE DB Provider Application
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