Multi-way Relationships

10/4/99


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Table of Contents

PPT Slide

Multi-way Relationships

Roles in Relationships

Roles in Relationships

Attributes on Relationships

Design Principles

What’s Wrong?

What’s Wrong?

Do we really need 3-way relationships?

Modeling Subclasses

Subclasses in ODL

PPT Slide

Multiple Inheritance

How do we resolve conflicts?

PPT Slide

Modeling Constraints

Keys

Keys in ODL

Keys in E/R Diagrams

Single Value Constraints

Referential Integrity Constraints

Weak Entity Sets

Author: Alon Levy

Email: alon@cs.washington.edu

Home Page: http://www.cs.washington.edu/homes/alon

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