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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 mentionedThe 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

Answer»

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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