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State true or false: Estimation of the size of the result of a join is not possible

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State true or false: Estimation of the size of the result of a join is not possible

(a) True

(b) False

I have been asked this question in an internship interview.

The origin of the question is Estimating Statistics of Expression Results in portion Query Processing and Optimization of RDBMS

1 Answer

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Best answer
Right option is (b) False

To explain: Estimation of the result of a join is possible and can be done using the Cartesian product and intersections of the two relations. It is more complicated than estimating size of a selection.

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