I want to create an aggregation pipeline which one of the matches use results from other collection (inner query). This is an example: db.users.aggregate([ {"$match":{"id":{&qu...

What are the ways to in Q to use the results of a nested query in a where clause? I'm looking for something similar to SQL statement. select from food where type_id in ( select type_id from type...

I have a table to be updated using records of another table and I am doing this to bring over information from one system (database) to another. The scenario is bit complex, but I desperately need ...