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I think the question is how much effort will it take to get all kinds of data from all kinds of sources into a nice, coherent schema.

The "schema-less" aspects of NoSQL data stores is a big part of the marketing appeal, I think.

(Maybe the JSON support in PostgreSQL makes this moot, but that's the thinking.)



You always have a schema. The only question is if you know what it is, or not.

In the next few years there will be a lot of money to be made getting data out of these stores and back into relational databases.




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