Write Joins in MongoDB

Unlike the relational databases, MongoDB doesn't allow you to join collections using the simple find queries, but you can write the join queries using the aggregation framework. In this lesson, we learn how to join two collections to get the data in the format we want.

The aggregation operators that we cover in this video are:

• $lookup
• $project
• $arrayElemAt

You can see the list of all the available operators in the MongoDB docs.