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About Greg Jorgensen

Greg Jorgensen develops web sites and databases, and consults on web strategy, usability, and security. For more information see http://www.pdxperts.com. Greg also started Geek School to help kids and teens learn computer programming. Please feel free to email the author with your comments about this article: gregj@pdxperts.com.
Introduction to Relational Database Systems
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If you collect and use any kind of data you probably have some kind of organizing system. Whether you use index cards, a filing cabinet, Excel spreadsheets, or some kind of database program, your system should let you add and change data, delete data, and retrieve data, and it should work faster and more efficiently than if you had to do it by hand.