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Nulls can cause quite a few headaches if you forget to consider their effect on your queries. The previous section looked at Nulls in a joining field. You also need to remember to check for comparisons involving fields that may contain Nulls. We looked at this in 2 and also earlier in this chapter. Consider two queries on the Member table with selection conditions Gender = 'M' and Gender <> 'M'. It is reasonable to think that all rows in the Member table should be returned

Bash offers some options that allow you to perform calculations from scripts. Of course, you re not likely to use them as a replacement for your spreadsheet program, but performing simple calculations from Bash can be useful. For example, you can use calculation options to execute a command a number of times or to make sure that a counter is incremented when a command executes successfully. The script in Listing 7-19 provides an example of how counters can be used.

Evince, File Roller, and Eye of GNOME are not present on the Applications menu. If you wish, you can add your own shortcuts for these applications by following the instructions in 9. b Playback of many media files is possible only after extra software is installed. See s 16 and 17 for more information.

If you want to temporarily open a file type with a different program, right-click the file. The context menu will display a set of options; for example, for an image, you will have Image Viewer (or Eye of the Gnome), Firefox, or F-Spot. Or you can select Open with Other Application and choose other program. From that point on, every time you right-click, you ll be offered the choice of that program to open the file. To make Nautilus automatically and permanently use the application to open the file type, rightclick it, select Properties, and then click the Open With tab. Click the Add button to locate the application you want to use if it s not in the list. Finally, ensure that the radio button alongside the program you want to use is highlighted (you may need to click twice for this to happen), as shown in Figure 10-5, and then click the Close button. This will change the program association for all the files with the same extension.

Listing 7-19 Using a Counter in a Script #!/bin/bash counter=1 while true do counter=$((counter + 1)) echo counter is set to $counter done As you can see, this script uses a construction with while (which is covered in more detail in the Using while section) The construction is used to execute a command as long as a given condition is met In this example, the condition is simple: you must be able to execute the true command successfully This won t be a problem: the name of the command is true because it always executes successfully That is, true always gives an exit status of 0, which tells the shell that it has executed with success, just like the false command always gives the exit status of 1 What has to happen if the condition is met is specified between the do and done.

by one of these queries. However, rows with a Null in the Gender field will return false for both these conditions (any comparison with a Null returns false), and the row will not appear in either result. Say we want to get a list of members of our club who are not particularly good players (to offer them coaching, perhaps). Someone may suggest a query like Listing 11-21 to find members who do not have a low handicap.

Figure 10-5. You can change which program opens a file by right-clicking, selecting Properties, and clicking the Open With tab.

Rhythmbox starts in browse mode, which means that your music files are listed at the bottom of the program window. In roughly the middle-left of the program window, you ll find a listing of the artists behind the MP3s in your collection. On the right, you ll see the album that the music track is taken from (provided that information is included in the music file itself, such as the MP3 ID3 tags). Figure 16-3 shows an example of a Rhythmbox window.