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It is very disturbing to be trying to find rows for Jim, to be able to see Jim in the table, and to have your query return nothing. This may be caused by one of the problems we looked at in the Problems with Data Values section earlier in this chapter. One quick way to eliminate the possibility of dodgy text values is to use LIKE for comparisons. For example, where you have = 'Jim', replace it with LIKE '%Jim%'. If the query then finds the row you were expecting (possibly along with some others), you know the problem is with the data. As noted earlier, putting the wildcard % (or * in Access) at the beginning and end of the string will find leading or trailing spaces and other nonprintable characters.

memory has improved enormously over the last few years, and you can expect the memory chip to support at least 100,000 writes. In many cases, however, more than 1,000,000 writes can be performed without any problem.

The main toolbar of Rhythmbox has changed in the latest Ubuntu release. Several new icons appear, allowing you to purchase and download the album, buy a physical CD, or learn more about the artist. The Ubuntu One music store behaves more like a web page embedded within the Rhythmbox window, and you can start browsing it straight away, as long as you re connected to the Net.

Songs from Jamendo are free to listen to, download, and share. Jamendo allows any artist to upload his or her music under one of the some rights reserved licenses published by Creative Commons. Fans can join the Jamendo community free of charge, write reviews, and share music with other members, and if you d like to support an artist with a donation, Jamendo makes it easy to do that.

So far, we ve dealt with only one method to do script calculations, but you have other options as well. First, you can use the external expr command to perform any kind of calculation. For example, the following line produces the result of 1 + 2: sum=`expr 1 + 2`; echo $sum As you can see, a variable with the name sum is defined, and this variable gets the result of the command expr 1 + 2 by using command substitution. A semicolon is then used to indicate that what follows is a new command. After the semicolon, the command echo $sum shows the result of the calculation. The expr command can work with addition, and other types of calculation are supported as well. Table 7-2 summarizes the options. Table 7-2. expr Operators

Tip Not only can you download the tracks from Jamendo, but you can also remix many of them or use snippets of them in your own music. All of this is because of the artists choice to use Creative Commons licenses. Many of them opt for a license which permits you to do exactly what you want with their music, as long as you credit the original artist and pass on the same rights to other people if you redistribute your work.

We discussed the problem of queries involving and or or in the previous chapter (in the Spotting Key Words in Questions section). I ll recap briefly. The word and can be used in English to describe a union and an intersection. When we say women and children, we really mean the union of the set of females and the set of young people. When we say cars that are small and red, we mean the intersection of the set of small cars and the set of red cars. If we are looking for women and children and use the selection condition Gender = 'F' AND age < 12, we are actually retrieving the intersection of women and children (or girls); the rows for older women and boys will be missing. We need the condition to be Gender = 'F' OR age < 12. It is very easy to unwittingly translate the and in the English question to an AND in the query inappropriately, which can result in missing rows.

If you want to download an album, select a song in the music list that is included in the album you would like to download, and then click the Download Album button on the toolbar. Firefox will visit a URL that includes a BitTorrent tracker file effectively, a small file that opens the Transmission BitTorrent client built into Ubuntu. BitTorrent will then attempt to download the entire album.