Example relationships - PowerPoint PPT Presentation

Chapter 4

Chapter 4. Database Processing. Agenda. Purpose of Database Terminology Components of Database System Multi-user Processing Database Design Entity-relationship Model Database Administration Database Security Discussion, Design, and Case Study. Purpose of Database.

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Basic Symbols

Basic Symbols. Student Entity type using E-R notation. Multivalued – Employee . Weak (attributive) entity. Example relationships of different degrees. 10. 5. Bill of Materials Unary Relationship. (a) Many-to-Many Relationship. (b) Two Instances. CA.

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Relations

Relations. Rosen 6 th ed., §8.1. Relations. Re lationships between elements of sets occur in many contexts Example relationships in everyday life: employee and her salary, person and relative, business and it’s phone number, etc.

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