Merge rows (diff)

Based on keys for comparison, this transform merges reference rows (previous data) with compare rows (new data) and creates merged output rows. A flag in the row indicates how the values were compared and merged. Flag values include:

• changed: The key was found in both rows, but one or more compared values are different.

• deleted: The key was not found in the compare rows.

If the row’s flag is identical or deleted, the merged output rows are based on the reference rows.

You can also send values from the merged and flagged rows to a subsequent transform in your pipeline, such as the Switch-Case transform or the Synchronize after merge transform. In the subsequent transform, you can use the flag field generated by Merge rows (diff) to control updates/inserts/deletes on a target table.