Database Management Systems Mcqs

Page No. 21

Consider a directed line(->) from the relationship set advisor to both entity sets instructor and student. This indicates _________ cardinality


aOne to many


bOne to one


cMany to many


dMany to one


View Answer One to one

The Rectangles divided into two parts represents


aEntity set


bRelationship set


cAttributes of a relationship set


dPrimary key


View Answer Entity set

The entity relationship set is represented in E-R diagram as


aDouble diamonds


bUndivided rectangles


cDashed lines


dDiamond


View Answer Diamond

Which of the following gives a logical structure of the database graphically?


aEntity-relationship diagram


bEntity diagram


cDatabase diagram


dArchitectural representation



A window into a portion of a database is


aSchema


bView


cQuery


dData dictionary


View Answer View

Which of the following is a low level operator?


aInsert


bUpdate


cDelete


dDirectory


View Answer Directory

Which of the following indicates the maximum number of entities that can be involved in a relationship?


aMinimum cardinality


bMaximum cardinality


cERD


dGreater Entity Count


View Answer Maximum cardinality

Given the basic ER and relational models, which of the following is INCORRECT?


aAn attribute of an entity can have more than one value


bAn attribute of an entity can be composite


cIn a row of a relational table, an attribute can have more than one value


dIn a row of a relational table, an attribute can have exactly one value or a NULL value



The total participation by entities is represented in E-R diagram as


aDashed line


bDouble line


cDouble rectangle


dCircle


View Answer Double line

Let us consider phone_number ,which can take single or several values . Treating phone_numberas an _________ permits instructors to have several phone numbers (including zero) associated with them.


aEntity


bAttribute


cRelation


dValue


View Answer Entity

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