Database Management Systems Mcqs

Page No. 82

Which one of the following is not true for a view:


aView is derived from other tables.


bView is a virtual table.


cA view definition is permanently stored as part of the database.


dView never contains derived columns.



The natural join is equal to :


aCartesian Product


bCombination of Union and Cartesian product


cCombination of selection and Cartesian product


dCombination of projection and Cartesian product



Which of the following is record based logical model?


aNetwork Model


bObject oriented model


cE-R Model


dNone of these


View Answer Network Model

Which of the following database object does not physically exist?


abase table


bindex


cview


dnone of the above


View Answer view

Which of the following is another name for weak entity?


aChild


bOwner


cDominant


dAll of the above


View Answer Child

Which of the operations constitute a basic set of operations for manipulating relational data?


aPredicate calculus


bRelational calculus


cRelational algebra


dNone of the above


View Answer Relational algebra

A set of possible data values is called


aattribute


bdegree


ctuple


ddomain


View Answer domain

Which of the following is a legal expression in SQL?


aSELECT NULL FROM EMPLOYEE;


bSELECT NAME FROM EMPLOYEE;


cSELECT NAME FROM EMPLOYEE WHERE SALARY = NULL;


dNone of the above



Which of the following is an advantage of view?


aData security


bDerived columns


cHiding of complex queries


dAll of the above


View Answer All of the above

The full form of DDL is


aDynamic Data Language


bDetailed Data Language


cData Definition Language


dData Derivation Language



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