Adding the Person Class to the Hierarchy

After adding the Student Class to the hierarchy, redundant attributes between the Student and Employee Class, which were not addressed in the original relational schema, still exist. They can be factored out into a Person Class, as illustrated below.

Adding the Person Class to the hierarchy

Next: Object schema for relational schema. Also see the related content below.

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More on the general topic: Multi-Type Views

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The Savvy Manager's Guide

Douglas K Barry is also the author of a book that explains Web Services, service-oriented architecture, and Cloud Computing in an easy-to-understand, non-technical manner.

Web Services, Service-Oriented Architectures, and Cloud Computing: The Savvy Manager's Guide

Web Services, Service-Oriented Architectures, and Cloud Computing: The Savvy Manager's Guide (Second Edition)

by with David Dick

This is a guide for the savvy manager who wants to capitalize on the wave of change that is occurring with Web Services, service-oriented architecture, and—more recently—Cloud Computing. The changes wrought by these technologies will require both a basic grasp of the technologies and an effective way to deal with how these changes will affect the people who build and use the systems in our organizations. This book covers both issues. Managers at all levels of all organizations must be aware of both the changes that we are now seeing and ways to deal with issues created by those changes.