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by wvenable
5959 days ago
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2 words: Query Optimizer
http://en.wikipedia.org/wiki/Query_optimizer If you think you're doing exactly that an RDBMS does, you're kidding yourself. Even if you do, you're still wasting effort re-coding something that already exists. The fact is, running the query on the order and filtering on the product may not be the most efficient way of getting the data. It might be faster query on the product and then filter based on the order. RDBMS's make those sorts of decisions all the time. |
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