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Understanding Entity Relationship Diagrams Developing Data M o d e l s for Business Databases
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Understanding Entity Relationship Diagrams
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Learning Objectives
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This chapter explains the notation of entity relationship diagrams as a prerequisite to using entity relationship diagrams in the database development process After this chapter, the student should have acquired the following knowledge and skills: Know the symbols and vocabulary of the Crow's Foot notation for entity relationship diagrams Use the cardinality symbols to represent 1 - 1 , 1-M, and M-N relationships Compare the Crow's Foot notation to the representation of relational tables Understand important relationship patterns Use generalization hierarchies to represent similar entity types Detect notational errors in an entity relationship diagram Understand the representation of business rules in an entity relationship diagram Appreciate the diversity of notation for entity relationship diagrams
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Overview
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2 provided a broad presentation about the database development process You learned about the relationship between database development and information systems development, the phases o f database development, and the kinds o f skills y o u need to master This chapter presents the notation o f entity relationship diagrams to provide a foun dation for using entity relationship diagrams in the database development process To extend your database design skills, 6 describes the process o f using entity relationship diagrams to develop data models for business databases To b e c o m e a g o o d data modeler, you need to understand the notation in entity relation ship diagrams and apply the notation on problems o f increasing complexity To help you master the notation, this chapter presents the symbols used in entity relationship diagrams and compares entity relationship diagrams to relational database diagrams that y o u have seen in previous chapters This chapter then probes deeper into relationships, the most distinguishing part o f entity relationship diagrams You will learn about identification dependency, relationship patterns, and equivalence between two kinds o f relationships
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Data Modeling Finally, you will learn h o w to represent similarities among entities using generalization hierarchies To provide a deeper understanding o f the Crow's Foot notation, business rule represen tation and diagram rules are presented To provide an organizational focus on entity relationship diagrams, this chapter presents formal and informal representation o f business rules in an entity relationship diagram To help y o u use the Crow's Foot notation correctly, this chapter presents consistency and completeness rules and explains their usage in the ER Assistant Because o f the plethora o f entity relationship notations, y o u may not have the opportu nity to use the Crow's Foot notation exactly as shown in s 5 and 6 To prepare you for understanding other notations, the chapter concludes with a presentation o f diagram variations including the Class Diagram notation o f the Unified Modeling Notation, one o f the popular alternatives to the Entity Relationship Model This chapter provides the basic skills o f data modeling to enable y o u to understand the notation o f entity relationship diagrams To apply data modeling as part o f the database development process, y o u should study 6 on developing data models for business databases 6 emphasizes the problem-solving skills o f generating alternative de signs, mapping a problem statement to an entity relationship diagram, and justifying design decisions With the background provided in both chapters, you will be prepared to perform data modeling on case studies and databases for moderate-size organizations
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Gaining an initial understanding o f entity relationship diagrams ( E R D s ) requires careful study This section introduces the Crow's Foot notation for E R D s , a popular notation sup ported by many C A S E tools To get started, this section begins with the basic symbols of entity types, relationships, and attributes This section then explains cardinalities and their appearance in the Crow's Foot notation This section concludes by comparing the Crow's Foot notation to relational database diagrams If y o u are covering data modeling before
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