Transcription of Entity Relationship Model - WBUTHELP.COM
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Entity Relationship Model - WBUTHELP.COM
chapter 2 Entity Relationship ModelThis chapter introduces the Entity - Relationship Model in detail. The chapter coversnumerous features of the Model , several of which can be omitted depending on theplanned coverage of the course. Weak Entity sets (Section ), design constraints(Section ) and aggregation (Section ), and the corresponding subsections ofSection (Reduction of an E-R Schema to Tables) can be omitted if time is short. Werecommend covering specialization (Section ) at least in some detail, since it isan important concept for object-oriented databases ( chapter 8).TheE-Rmodel itself andE-Rdiagrams are used often in the text. It is importantthat students become comfortable with them. TheE-Rmodel is an excellent contextfor the introduction of students to the complexity of database design . For a givenenterprise there are often a wide variety ofE-Rdesigns.
This chapter introduces the entity-relationship model in detail. The chapter covers numerous features of the model, several of which can be omitted depending on the planned coverage of the course. Weak entity sets (Section 2.6), design constraints (Section 2.7.4) and aggregation (Section 2.7.5), and the corresponding subsections of
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