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The relational algebra select operation retrieves rows from a table. To decide which rows to retrieve, we need to specify a condition for the operation. Basically, a condition is a statement that is either true or false. We apply the condition to each row in the table independently, retaining those rows for which the condition is true and discarding the others. Say we want to find all the men our club, as in Figure 2-2a. Fortunately, when we designed our database in 1, we foresaw such a query and included an attribute Gender in the Member table. We want just that subset of rows where the value in the Gender field is M , so this becomes the condition for the select operation. Listing 2-1 shows the notation for this operation. The Greek letter sigma ( ) is shorthand for select, the table we are applying the operation to is in parentheses (Member), and the subscript Gender = 'M' is the condition.

Figure 1-2. If you did not specify the installation language in the boot screen, you have another chance of selecting the language here. 3. Based on the language that you selected, you ll see a list of countries (see Figure 1-3). Select your country to make sure that other settings are applied automatically. If your country is not in the default list, browse to the bottom of the list and select Other, which supplies a larger list.

Windows Media Player format is the default for most Windows users. Although it s possible to play Windows Media Player files under Ubuntu (files in WMP1, WMP2, and WMP3 formats), you won t be able to play DRM-restricted files (those that rely on the download and installation of a certificate), such as those from the increasing number of movie rental sites. By downloading the GStreamer plug-in package when prompted, you can play back RealVideo files in Totem. However, you can also download a Linux version of RealPlayer.

QuickTime is Apple s default media format and has gained ground on both Windows and Macintosh computers. As with Windows Media Player file playback, you won t be able to play DRM-restricted files. The DivX format is one of the most popular formats for those in the Internet community who like to encode their own movies. It s renowned for its ability to shrink movies to very small sizes.

Ubuntu Server makes some choices for you automatically. If you want to make these choices yourTip

Video and audio playback within the Firefox web browser are handled via the Totem browser plugin (In Firefox, see Tools Add Ons Plugins for a list of currently installed plug-ins. These plug-ins work in exactly the same way as the Windows Media Player and QuickTime browser plug-ins work under Windows. This is set up automatically during initial installation of Ubuntu and is also compatible with the GStreamer codec plug-ins after they are installed. However, when you try to retrieve streaming content, many web sites attempt to probe your setup to ensure that you have the required media player software, and they may balk when they can t find Windows Media Player or QuickTime. This makes playback difficult, although more and more sites are switching to video playback via Flash Player. Additionally, some web sites use Java applets to present content. You can install support for both Flash and Java through Firefox. Next we cover how to install codecs for movie file formats, as well as how to install the Linux version of RealPlayer and support for Flash and Java.

Gender= 'M' (Member)

The codecs for video playback are created by the open source community and are therefore entirely free of copyright issues, but it is claimed that some utilize patented technology. As you might expect, this makes for another legally gray area. It s unlikely that the patent holders sanction the distribution of the codecs in countries that allow software to be patented. As with audio playback codecs, you will need to decide whether the caveats shown by Ubuntu during the installation of the codecs apply to you.

self, use the Go Back button that appears in almost every screen of the installer. This will display a more detailed list of options that are relevant to that particular stage of the installation, and you can choose what you want to do yourself.