Applications get great efficiency from MongoDB by combining data that is accessed together into a single document. There are however situations where it is more efficient to have references between documents rather than embedding everything into a single document. This led to joins being our most requested feature. MongoDB 3.2 addresses this through the introduction of the $lookup stage in the aggregation pipeline to implement left-outer joins.

This webinar looks at $lookup as well as the other significant aggregation enhancements coming with MongoDB 3.2—why they're needed, what they deliver, and how to use them.

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Want to learn more about what's new in MongoDB 3.2? Download the guide

What's New in MongoDB 3.2