Useful NiFi approach! Run the query: ExecuteSQL or a similar processor can retrieve the required database value. Store the result: Capture the returned value and make it available for the FlowFile. Set the attribute: UpdateAttribute can then assign the SQL result to the desired FlowFile attribute. Check the flow: Make sure the query result, data type, and attribute scope are handled correctly. This approach keeps the SQL lookup and FlowFile attribute update nicely separated and easier to troubleshoot. ... View more