If you need to send sensitive data over the Internet you should encrypt it first. Anybody knows this. Right, but what about the other side? You correspondent will probably not like the idea of buying and learning some software just to decrypt your file. No problem here if you are using Silver Key! Right-click the file or folder you wish to send and select the “Create EXE Parcel” command (screenshot). Silver Key compresses and encrypts your data and adds a small decryptor. Your correspondent doesn’t need to install any decrypting program because the parcel already contains all the needed software.

Relational databases hold data, right? They indeed do, but to think of a database as nothing more than a container for data is to miss out on the profound power that underlies relational technology. A far more powerful way of thinking lies in relational technology’s foundation in the mathematical disciplines of logic and set theory. Databases contain truths or propositions describing some area of interest such as a business. Those truths are organized into sets. Operations from logic and set theory can be applied to existing sets of truths to derive new sets of truths. Applied Mathematics for Database Professionals introduces you to this way of thinking, to the logic and set theory that underlies relational database technology. All this may sound abstract now, but there are profound benefits from the deeper understanding you’ll gain from this book. You’ll learn to
The math that you learn in this book will put you above the level of understanding of most database professionals today. You’ll better understand the technology and be able to apply it more effectively. You’ll avoid data anomalies like redundancy and inconsistency. Understanding what’s in this book will take your mastery of relational technology to heights you may not have thought possible. This book is reviewed and endorsed by C. J. Date and features a foreword by the same.


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