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Whether you keep the duplicates depends very much on the information you require, so you need to give it some careful thought. If you were expecting the set of rows in Figure 2-8b and got Figure 2-8a, you would most likely notice. With the two sets of rows in Figure 2-7, it is much more difficult to spot that you have perhaps made a mistake. Get into the habit of thinking about duplicates for all your queries.

at least one local external reference clock on your network as well. This way you can ensure that time synchronization continues if the Internet connection fails for a longer period.

Ubuntu refers to the look of the desktop as a theme. Whether you opt to use GNOME or KDE as your main desktop, Ubuntu allows you to radically personalize the whole visual experience. Several themes come with the distribution, and you can download many more. Each lets you change the way the windows look, including the buttons, scrollbars, window decoration, and icon set (although some themes come without additional icons). There is also a small selection of assistive themes designed to improve the desktop experience for partially sighted users. However, unlike Windows themes, GNOME themes don t usually change the fonts used on the desktop, and the background will probably remain broadly the same. You can change these manually, as described in the Setting Font Preferences and Changing the Desktop Background sections a bit later in this chapter. The other difference is that GNOME has these facilities built in you won t need to buy or install extra software just to change the desktop appearance. To alter the theme, choose System Preferences Appearance. Then it s simply a matter of choosing a theme from the list on the Theme tab in the Appearance Preferences dialog box, as shown in Figure 9-1. Each selection has a small thumbnail to show you what the theme looks like. When you select one, it will be applied immediately to the desktop, including any open applications and windows. To get a really good idea of how the theme looks, you can open a Nautilus window by choosing Place Home Folder. This will give you a feel for how the icons, window decorations, and widgets such as scrollbars and menu bars look in a real-world context.

Note The default Ubuntu themes until Lucid Lynx were branded as Human and were designed to represent the

The second line defines what should happen when the server falls back to the local external reference clock mentioned on the first line. This line starts with the keyword fudge to indicate an abnormal situation. Here, the local clock should be used, and the server sets its stratum level to 10. By using this stratum, the server indicates that it s not very trustworthy, but ensures that it can be used as a time source if necessary. The last line in Listing 9-12 shows what should happen under normal circumstances. This line normally refers to an IP address or a server name on the network of the Internet provider. This line will always be used if nothing strange is happening.

Every now and then I refer to a set of rows rather than a table or a virtual table. Our formal definition of a database is a set of tables, and for a table the definition is a set of rows. 3 The word set has two implications. One is that there are no duplicates (and we have discussed that a lot!). The other implication is that there is no particular order to the rows in our set. In theory, we don t have a first row or a last row or a next row. If we run a query to retrieve all the rows, or just some of the rows, from a table, then we have no guarantee in what order they will be returned. However, sometimes we might like to display the result in a particular order. We can do this with the key phrase ORDER BY. Listing 2-22 shows how to retrieve member information ordered alphabetically by LastName.