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The union of all records satisfying the individual simple conditions Oi is called as ________

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The union of all records satisfying the individual simple conditions Oi is called as ________

(a) Conjunctive selection

(b) Disjunctive selection

(c) Negation

(d) None of the mentioned

The question was asked during an internship interview.

My question is based upon Estimating Statistics of Expression Results in portion Query Processing and Optimization of RDBMS

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Correct choice is (b) Disjunctive selection

To explain: The union of all records satisfying the individual simple conditions Oi is called as disjunctive selection. It is a form of a complex selection.

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