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The other thing I would change, for clarity and simplicity, is to avoid "WHERE A>= B AND A<= C" statements, preferring instead "WHERE A BETWEEN B AND C"I might argue that unless you're familiar with BETWEEN you might not know that it is inclusive. Without knowing the convention, it's just as possible that BETWEEN B and C could exclude the values B and C. By explicitly stating >= B and <= C, it's a bit more self documenting at least to old geezers like me. :) And believe me, I love writing less words, and I even use BETWEEN on occasion, but I do find myself every once in a while saying "Okay, BETWEEN is inclusive, not exclusive, right?".
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