John J. Patrick Books

"Based on John Patrick's hands-on SQL course for IT pros at the University of California, Berkeley, this book shows exactly how to retrieve the data you want, when you need it, in any application -...

SQL fundamentals

By John J. Patrick

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The young Oxford companion to the Supreme Court of the United States

By John J. Patrick

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An introduction to the Supreme Court, using the device of alphabetically listing and explaining its decisions, justices, concepts, legal terms, practices, and issues.

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.