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Re:Goodbye MongoDB, Hello PostgreSQL (2015) by asya999 on Thursday March 11, 2021 @03:09PM (#26428429)
MongoDB is not a key-value store. It's a document database.
Re:Goodbye MongoDB, Hello PostgreSQL (2015) by StreamBright on Friday March 12, 2021 @03:29AM (#26433402)
"Document-oriented databases are inherently a subclass of the key-value store, another NoSQL database concept."

https://en.wikipedia.org/wiki/Document-oriented_database