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Quiz About

Entity Relationship

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Question 1

An entity isA. A real physical “thing”

that is specific to a particular database management system

C. A “thing” which has either a real physical existence (e.g. a car or a student) or a conceptual existence (e.g. a course)

B. A real physical “thing” or a conceptual “thing” that is specific to a particular database management system

D. Any physical “thing” that exists in the real world

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Question 2

The symbol represents a

A. A one to one relation

C. A many to many

relation

B. A many to one

relation

D. A one to many

relation

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A. A student can own

many cars and a car

can be owned by

many students

C. A car can be owned

by many students

B. That a student can

own 0,1 or more

cars

D. A student cannot

own a car

Question 3

The graphic indicates

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Question 4

The symbol represents

A. An entity

C. An attribute

B. A record

D. A relation

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Question 5

An instance is

A. Any particular entity

C. An attribute of an

entity

B. A particular

occurrence of an

entity (e.g. Tom is

an instance of the

entity STUDENT)

D. A special type of

relation

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Question 6

The ER model is meant to

A. Enable detailed

descriptions of data

query processing

C. Enable low level

descriptions of data

B. Replace relational

design

D. Be close to a users

perception of the

data

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Question 7

This graphic

A. Indicates that

many students can

attend many

courses

C. Indicates that there

is a missing entity

B. Indicates that

students have to

attend more than one

course

D. Indicates that

students attend

courses

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Which of the following statements best

describes the function of an entity relation

model

A. An ER model is concerned primarily with a logical view of the data and secondly with the physical implementation

C. An ER model provides a view of the logic of the data and not the physical implementation

B. An ER model is concerned primarily with a physical implementation of the data and secondly with the logical view

D. An ER model is entirely concerned with modeling the physical implementation

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Key

• 1) D

• 2) D

• 3) B

• 4) A

• 5) B

• 6) D

• 7) C