How a 1970 IBM research paper on the relational model produced a declarative query language that outlasted its rivals, survived a decade-long NoSQL insurgency, and quietly absorbed the very systems that tried to replace it.
Nosql
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The Story of SQL -
MongoDB Done Right The document database past the hype: the embed-versus-reference decision that makes or breaks a schema, denormalization that does not rot, when MongoDB genuinely beats Postgres JSONB and when it does not, the aggregation pipeline, indexing and the working-set rule, replica sets and sharding, the read/write-concern consistency knobs, and the operational footguns — unbounded arrays and the 16 MB BSON limit — that sink naive designs.