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I m a big fan of always saying SELECT * in the early stages of developing queries that involve joins. Consider the query in Listing 11-18. If we suspect a problem with the joins, then by leaving all the columns visible, we can see if the join conditions are behaving as expected. Once we are happy with the rows being retrieved, we can retain just the columns required. However, if you are combining tables with set operations, this approach will be counterproductive, as projecting the right columns is critical (see the Do You Have Correct Columns in Set Operations section later in this chapter).

In simple terms, three software components are needed for multimedia playback under Ubuntu: Player application: This is the software that s used to listen to music or display videos. It s the part of the multimedia system that you interact with. Under Ubuntu, Totem movie player is used to play back video, and Rhythmbox is used to handle audio. However, if you install the KDE desktop, Dragon Player is used to play back movies, and Amarok handles audio playback. Multimedia framework: This is the behind-the-scenes middleman that puts the player application in touch with the codec plug-ins. The multimedia framework preferred by Ubuntu is called GStreamer; KDE is able to use a choice of backends, including GStreamer and Xine. The multimedia framework is a background component of your system, and you won t come into direct contact with it, apart from when you re initially configuring your system for media playback. However, it s important to note that more than one multimedia framework can be installed, because this is sometimes necessary to utilize certain codecs. In 17, you

learn how to install additional software in order to fully support DVD playback under Ubuntu. Codec plug-ins: Codecs are the small pieces of software that handle multimedia file decoding. Codecs do all the hard work the number crunching. Most multimedia file formats are compressed, to make for smaller file sizes, and the codec s job is to expand the files again so they can be played back on your computer. Some codecs also work the other way around by shrinking files; if you rip CD tracks to MP3, or convert DVD videos to movie files on your hard disk, you will need to shrink them for ease of storage.

auto lo eth0 br0 iface lo inet loopback iface br0 inet dhcp bridge_ports eth0 bridge_maxwait 2 up /sbin/ifconfig eth0 inet 0.0.0.0 promisc In this configuration, the first line specifies the network interfaces that you need on your machine. Following that, the lo interface is defined as the loopback interface. Next, the interface br0 is defined as a new interface that uses DHCP to connect to other machines. Next, the line bridge_ports eth0 tells the system that only the local network interface (eth0) is connected to the bridge. The bridge itself gets 2 seconds to become available in the line bridge_maxwait 2. Finally, the last line enables the network card eth0. In this configuration, eth0 is the interface that talks directly to the physical network board. No IP address is required for this because the IP address is assigned to the bridge interface. However, the eth0 interface does have the promisc option which tells us it is to be used in promiscuous mode. This is a requirement because, without this option, the virtual network interfaces in the virtual machine can t share the same driver to communicate with the bridge. Within the host operating system, the bridge is assigned an IP address, which is the same as the IP address used by the host. After configuring all this, you must start the virtual machines with a network interface card. For example, the following line starts the virtual machine which is on the disk image windows.img, using a network card: kvm -no-acpi -m 512 -net nic -net tap windows.img

Under Ubuntu, the GStreamer multimedia framework is installed by default, along with a handful of codecs.

If you have a problem with a query involving an aggregate for example, SELECT AVG(Handicap) FROM ... WHERE ... check that you have retrieved the correct rows first. Change the query to SELECT * FROM ... WHERE ..., and confirm that this returns the rows for which you want to find the average. In fact, I recommend always doing this with an aggregate, because it is difficult to otherwise check if the numbers being returned are correct.