Lookup
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@ -42,6 +42,7 @@ Mongo doesn't require schema or relations but if you need to, you can have them.
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`Many-to-many` is also the same concept but with arrays.
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The issue is that we might have to update each embedded document in case some information changes. It is better to use references in this case.
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[More about relationships here](https://docs.mongodb.com/manual/applications/data-models-relationships/)
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You can also have JOIN-like queries with `$lookup`, learn more [here](https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/#mongodb-pipeline-pipe.-lookup)
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# Projections
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Sometimes we don't need the whole document, just a few data, so we can select just the data we need in the second parameter like so:
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