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      Question

      Query optimization heuristics often

      include:
      A Push selections early Correct Answer Incorrect Answer
      B Join smaller tables first Correct Answer Incorrect Answer
      C Replace cartesian products with joins Correct Answer Incorrect Answer
      D Use indexes where possible Correct Answer Incorrect Answer
      E All of the above Correct Answer Incorrect Answer

      Solution

      All are heuristics used before cost-based optimization to reduce intermediate result size.

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