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You can hardly interview a young developer today who doesn't claim a good working knowledge of SQL, the lingua franca of database access, a standard part of any basic IT course. This claim is usually reasonably true, if you define knowledge as the ability to obtain, after some effort, functionally correct results. However, enterprises all over the world are today confronted with exploding volumes of data. As a result, "functionally correct" results are no longer enough: they also have to be fast
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