Joining different datasets

Task: Merge two datasets into one based on matching rules Why: A powerful capability of n8n is to easily branch out the workflow in order to process different datasets. Even more powerful is the ability to join them back together with SQL-like joining logic. Main use cases: Appending data sets Keep only new items Keep only existing items

Help me set up the n8n workflow "Joining different datasets" (https://n8n.io/workflows/1747). It uses: . Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.