Database Systems: Design, Implementation, Management, Loose-leaf Version
Database Systems: Design, Implementation, Management, Loose-leaf Version
12th Edition
ISBN: 9781305866799
Author: Coronel, Carlos; Morris, Steven
Publisher: Course Technology
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Chapter 4, Problem 7RQ

a)

Program Plan Intro

Graphical representation of ERM (Entity Relationship Model) entity component:

Crow’s Foot entity box for “Student”

<x-custom-btb-me data-me-id='1521' class='microExplainerHighlight'>Database</x-custom-btb-me> Systems: Design, Implementation, Management, Loose-leaf Version, Chapter 4, Problem 7RQ , additional homework tip  1

b)

Program Plan Intro

Graphical representation of ERM cardinality component:

The following table illustrates the different connectivity and participation combinations which are maintained by the Crow’s Foot notation:

Crow’s Foot cardinality notation

Notation Cardinality Description
Database Systems: Design, Implementation, Management, Loose-leaf Version, Chapter 4, Problem 7RQ , additional homework tip  2 (0,N) Zero or more instances
Database Systems: Design, Implementation, Management, Loose-leaf Version, Chapter 4, Problem 7RQ , additional homework tip  3 (1,N) One or more instances
Database Systems: Design, Implementation, Management, Loose-leaf Version, Chapter 4, Problem 7RQ , additional homework tip  4 (1,1) One instance
Database Systems: Design, Implementation, Management, Loose-leaf Version, Chapter 4, Problem 7RQ , additional homework tip  5 (0,1) Zero or one instance

c)

Program Plan Intro

Graphical representation of ERM entity component:

Crow’s Foot weak relationship symbol

Database Systems: Design, Implementation, Management, Loose-leaf Version, Chapter 4, Problem 7RQ , additional homework tip  6

d)

Program Plan Intro

Graphical representation of ERM entity component:

Crow’s Foot strong relationship symbol

Database Systems: Design, Implementation, Management, Loose-leaf Version, Chapter 4, Problem 7RQ , additional homework tip  7

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