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When answering this question, I wrote up this SQL answer, which works fine from my machine.

However, on SE data, it always picks the same winner. Is it possible that SE Data fixes rand() to a specific number? If so, why is that?

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up vote 8 down vote accepted

The data explorer caches results; if you run identical queries, it will only call the database once, and deliver the cached result on subsequent queries.

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That explains it, perhaps SE Data could explain a warning for queries using rand() – Andomar Jul 28 '11 at 9:34

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