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Relational Calculus and Relational Algebra Objective Questions and Answers | Database Management System MCQs

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Database management system objective questions and answers page contain 5 questions from chapter Relational algebra and calculus. Each MCQ has 4 possible answers. Choose your answer and check it with the given correct answer.
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(11) Which clause from the following corresponds to the projection operation of the relational algebra ?
[A] from
[B] select
[C] where
[D] none of these

Comment

Answer: Option [B]
(12) Which one of the clause is useful in defining the notion of tuple variable ?
[A] as
[B] by
[C] from
[D] none of these

Comment

Answer: Option [D]

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(13) The intersect operation :
[A] automatically eliminates duplicates
[B] automatically eliminates duplicates, if we provide all clause with intersect
[C] never eliminates duplicates
[D] none of these

Comment

Answer: Option [A]
(14) Which symbol is used to select tuples in relational algebra ?
[A] Alpha
[B] Beta
[C] Sigma
[D] Phi

Comment

Answer: Option [C]
(15) Consider the join of relation a with a relation b. If A has k tuples and B has r tuples then the maximum and minimum sizes of the join respectively are
[A] K + r and 0
[B] r.k and 0
[C] r + k and |k-r|
[D] r.k and r+k

Comment

Answer: Option [B]

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DATABASE MANAGEMENT SYSTEM MULTIPLE CHOICE QUESTIONS & ANSWERS – E-BOOK

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