Database Basics
The fact that you are reading a book on SQL indicates that you, somehow, need to interact with databases. SQL is a language used to interact with databases, and so before looking at SQL itself, it is important that you understand some basic concepts about databases and database technologies.
Whether you are aware of it or not, you use databases all the time. Each time you select a name from your email address book, you are using a database. If you conduct a search on an Internet search site, you are using a database. When you log into your network at work, you are validating your name and password against a database. Even when you use your ATM card at a cash machine, you are using databases for PIN number verification and balance ...
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