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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