Relational Database Management System Mcqs

Page No. 19

If the decomposition is able to represent all the facts about the relation then such a decomposition is called as?


aLossless decomposition

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bLossy decomposition

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c Insecure decomposition

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dSecure decomposition

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If the decomposition is unable to represent certain important facts about the relation, then such a decomposition is called as?


aLossless decomposition

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b Lossy decomposition

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cInsecure decomposition

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dSecure decomposition

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The dependency rules specified by the database designer are known as _______


aDesigner dependencies

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bDatabase rules

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c Functional dependencies

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dNone of the mentioned

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Which of the following is not a feature of a good relational design?


a Specifying primary keys

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bSpecifying foreign keys

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cPreserving integrity constraints

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d Allowing redundancy of attributes

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State true or false: The fourth normal form does not exist and it is instead called as the BCNF.


a True

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b False

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ceither true of false

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dnone of these

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View Answer False

State true or false: A functional dependency must first satisfy the second normal form to satisfy the third normal form.


aTrue

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bFalse

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ceither true of false

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dnone of these

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View Answer True

F+ is called as the ________ of F


aClosure

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b Sum

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cCartesian product

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dNone of the mentioned

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View Answer Closure

Which of the following is not a condition for the third normal form in the case of XY?


aX→ Y is trivial

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bX is the superkey for R

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cEach attribute in Y-X is a candidate key for R

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dEach attribute in X-Y is a candidate key for R

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Which of the following is used to express database consistency?


aPrimary keys

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bFunctional dependencies

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cCheck clause

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dAll of the mentioned

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View Answer All of the mentioned

Which of the following is not a condition for X→ Y in Boyce codd normal form?


aX → Y is trivial

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bX is the superkey for the relational schema R

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c Y is the superkey for the relational schema R

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dAll of the mentioned

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