This figure presents a comparison of some basic terms used in relational and object technology. New technology, in this case object technology, often creates new terms to go with the new technology. There are similarities and differences between relational and object technology. For example, a relation is similar to a class. Yet, a relation does not have the concept of inheritance that is found with a class. A tuple is similar to an instance object. Yet, a tuple is limited to the data structure it can hold. An instance object can handle any data structure supported by C++ or Java. A column is similar to an attribute. Yet, a column is limited to certain data types. An attribute can hold any C++ or Java data type including references to other objects. Finally, a stored procedure is significantly different than a method. Methods are computationally complete because they are written in object programming languages such as C++ or Java. Most stored procedure languages are limited when compared to C++ or Java.
More on the general topic: Comparing Object and Relational Models
Author: Douglas K Barry
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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 (Second Edition)
by Douglas K Barry 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.