How to Run Queries Across Collections

The following tutorials take you through the steps for querying across multiple collections:

• The How to Run Queries on Multiple Collections tutorial demonstrates how to index and query on multiple collections using a combination of On-Demand Materialized Views and Atlas App Services Scheduled Triggers.

• The How to Run $lookup with an Atlas Search $search Query tutorial demonstrates how to perform cross-collection search by first joining collections in the same database using $lookup, and then running a query in the sub-pipeline using $search

• The How to Run $unionWith with an Atlas Search $search Query tutorial demonstrates how to search multiple collections using $search in the $unionWith aggregation stage sub-pipeline.