Workstudy View Equivalent from the Class Hierarchy

With the Workstudy Class, we continue checking the class hierarchy against the original relational views. The relational Workstudy View required the joining of data from both the Employee and the Student base tables. In this object schema, as it has been constructed, this joining is not necessary. The same data shown in the relational Workstudy View can be obtained by simply querying the Workstudy Class as shown below. This is because the Workstudy Class inherits from both the Student and Employee Classes in addition to the Person Class. A join operation is not needed.

Workstudy View equivalent from the class hierarchy

Next: Employee View equivalent from the class hierarchy. Also see the related content below.

Related Articles

More on the general topic: Checking the Class Hierarchy

Related Fact Book

You may use this material for your work or classes. Reprint Policy. Be sure to check the menu at the left for other articles available on this site.

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.