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State true or false: Making multiple copies of the same sub-expressions must be avoided

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State true or false: Making multiple copies of the same sub-expressions must be avoided

(a) True

(b) False

I have been asked this question during an interview.

Asked question is from Choice of Evaluation Plans in chapter Query Processing and Optimization of RDBMS

1 Answer

+1 vote
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Best answer
Correct answer is (a) True

The explanation is: For promoting space efficiency, making multiple copies of the same sub-expressions must be avoided.

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