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> agreed, you can have reference fields to other collections and filter by them or query related data.

Yes it has that, but that's an anti-pattern. What I'm referring to is schema design. In Mongo you denormalize and store relational data in the same document as references. In SQL you a record might be split up into 3 tables, in Mongo that should all live in the same document. If you can't embed and need lookups, you should avoid Mongo and other nosql DBs



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