The mood today on HN: NoSQL was a fad, there is very rarely any reason to use anything other than a traditional DB. Are they right?
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NoSQL DBs were *way* overused for problems they were not designed for, but they have their strengths if you know what you're doing.
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Relational DBs are often a safer bet though, especially when requirements are still up in the air. PG also now has limited NoSQL support.