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


bLossy decomposition


c Insecure decomposition


dSecure decomposition



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


aLossless decomposition


b Lossy decomposition


cInsecure decomposition


dSecure decomposition



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


aDesigner dependencies


bDatabase rules


c Functional dependencies


dNone of the mentioned



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


a Specifying primary keys


bSpecifying foreign keys


cPreserving integrity constraints


d Allowing redundancy of attributes



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


a True


b False


ceither true of false


dnone of these


View Answer False

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


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

F+ is called as the ________ of F


aClosure


b Sum


cCartesian product


dNone of the mentioned


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


bX is the superkey for R


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


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



Which of the following is used to express database consistency?


aPrimary keys


bFunctional dependencies


cCheck clause


dAll of the mentioned


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


bX is the superkey for the relational schema R


c Y is the superkey for the relational schema R


dAll of the mentioned



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