7
Joining Data Examples
This chapter offers guidance on joining together data from two collections. Contrary to what you may have heard, MongoDB is quite capable of performing these joins. The method of data manipulation will differ depending on whether you're executing a one-to-one or one-to-many join. You will explore solutions for both scenarios.
This chapter will cover the following:
- Implementing one-to-one joins
- Implementing one-to-many joins
- Dealing with multiple fields on each side of the join
One-to-one join
Sometimes, you need to join data between two collections, where one document in the first collection maps to one, and only one, document in the second collection. This section provides an example of performing this one-to-one join ...
Get Practical MongoDB Aggregations now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
