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Because you re holding this book in your hands, there is a good chance that you have heard of Ubuntu Linux before. Maybe someone suggested it to you or you have read about it in the media. Anyway, we will try to show you how you can use it to make your life easier. First we point out ten (though there are certainly more) good reasons why you should give it a try. Then we talk about Ubuntu Linux in more detail, showing what it is and what it is like to work with. We will be happy if, by the end of this chapter, you feel confident enough to install Ubuntu Linux on a PC. Of course, you ll get the maximum benefit from it by reading the rest of the book. Without proper guidance you may sometimes feel that Linux is a wild jungle, but this book can help you become an expert user.

ou probably chose Ubuntu as a server solution because of either your gratifying experience using it on the desktop or the raves you ve heard from others about its user-friendly approach. Accordingly, you might expect the general Ubuntu Server installation process to be fairly easy, and indeed it is. Nevertheless, because your ultimate goal is to deploy the server in a production environment, it s a good idea to follow some key aspects of the installation process with rigor, and this chapter is intended to help you do exactly that. To keep things as simple as possible, you ll read how to complete the installation on a real server, with no virtualization involved. You ll explore the different options presented to you while installing Ubuntu, as well as the best choice to make to ensure that your installation is successful.

query is a way of retrieving some subset of information from a database. That information might be a single number such as a product price, a list of members with overdue subscriptions, or some sort of calculation such as the total amount of products sold in the past 12 months. Once we retrieve this subset of data, we might want to update the database records or include the information in some sort of report. Before getting into the nuts and bolts of how to build queries, it is necessary to understand some of the ideas and terminology associated with relational databases. In particular, it is useful to have a way of depicting how a particular database is put together, that is, what data is being kept in what tables and how everything is interrelated. It is imperative that any database has been designed to accurately represent the situation it is dealing with. With all the fanciest SQL in the world, you are unlikely to be able to get accurate responses to queries if the underlying database design is faulty. If you are setting up a new database, you should refer to a design book1 before embarking on the project. In this chapter, we will look at some of the basic ideas of data models and relational theory so we can get started on formulating queries in SQL. Later chapters will expand on these ideas, as required. You will also learn about two important ways to think about queries: relational algebra and relational calculus.