Database Management Systems Mcqs

Page No. 83

Which of the following operations need the participating relations to be union compatible?


aUNION


bINTERSECTION


cDIFFERENCE


dAll of the above


View Answer All of the above

Which of the following operation is used if we are interested in only certain columns of a table?


aPROJECTION


bSELECTION


cUNION


dJOIN


View Answer PROJECTION

What is a relationship called when it is maintained between two entities?


aUnary


bBinary


cTernary


dQuaternary


View Answer Binary

The conceptual model is


adependent on hardware.


bdependent on software.


cdependent on both hardware and software .


dindependent of both hardware and software.



Relational Algebra is


aData Definition Language


bMeta Language


cProcedural query Language


dNone of the above



SET concept is used in :


aNetwork Model


bHierarchical Model


cRelational Model


dNone of these


View Answer Network Model

E-R model uses this symbol to represent weak entity set ?


aDotted rectangle.


bDiamond


cDoubly outlined rectangle


dNone of these



The statement in SQL which allows to change the definition of a table is


aAlter


bUpdate


cCreate


dselect


View Answer Alter

It is possible to define a schema completely using


aVDL and DDL.


bDDL and DML.


cSDL and DDL.


dVDL and DML.


View Answer DDL and DML.

Count function in SQL returns the number of


avalues


bdistinct values


cgroups


dcolumns


View Answer values

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