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We can probably make an educated guess that Melissa is probably meant to be a Junior rather than a Junor , but we don t want our database to be second-guessing what it thinks we mean. We can prevent typos like this by placing a constraint called a foreign key on the Member table. We tell the database that the MemberType column in the Member table can have only a value that already exists as a primary key value in the Type table (for this example, that means it must be either Junior , Senior , or Social ). The terminology for this is to create the MemberType field as a foreign key that references the Type table. With this constraint in place, Junior is OK because we have a row in the Type

A common use of the ip tool is to display information about the use of IP addresses for a given interface. The command to use is ip address show. Note that, if it is clear exactly what you want and there can be no confusion between options, you can specify the options used with the ip command in short form, such as ip a s, which accomplishes the same thing as ip address show. This command displays the information in Listing 8-6.

Me menu: A new element introduced with Lucid Lynx the Me Menu, indicated by your username on the panel and located to the left of the Off button allows you to easily set your status for various IM clients and post to social network sites like Facebook or Twitter without having to log in to them Its functionality is explained in depth in 15 Clock: The clock is located at the top right of the screen Clicking it brings up a handy monthly calendar and a drop-down panel that contains a miniature world map, regional time, and weather.

for several locations. Click it again to hide this display. Right-clicking the clock brings up a context menu. On this menu, the Preferences option lets you alter the way the date and time are displayed and enables you to define a default location for weather information (displayed in the system tray to the left of the clock). The Adjust Date & Time option lets you change the time and/or date if they re incorrect. Indicator applet: The Indicator applet, represented by an envelope icon next to the clock, allows you to configure instant message (IM) and mail accounts, and is used by those same accounts to inform you when a change has occurred, such as new incoming mail or an IM from one of your contacts. Notification area: This is similar to the Windows system tray. Programs that like to hang around in memory, such as the Rhythmbox media player or Skype, add icons in this top-right area to allow quick access to their functions. The Software Update Notifier appears in this area to let you know that software updates are available (similar to Windows Update). Network Manager displays an icon here when you are connected to the network. The Volume Control applet is here too. Usually, you simply need to click (or right-click) their icons to access the program features.

Listing 8-6. Showing ip Address Configuration with ip address show root@ZNA:~# ip address show 1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:0c:29:a0:a5:80 brd ff:ff:ff:ff:ff:ff inet 192.168.1.33/24 brd 192.168.1.255 scope global eth0 inet 10.0.0.10/8 brd 10.255.255.255 scope global eth0:0 inet 10.0.0.20/8 brd 10.255.255.255 scope global secondary eth0:1 inet6 fe80::20c:29ff:fea0:a580/64 scope link valid_lft forever preferred_lft forever If you look hard enough, you can see that the result of ip address show is almost the same as the result of ifconfig. It s just presented differently.

7. For more information about database design, refer to my other Apress book, Beginning Database Design: From Novice to Professional (Apress, 2007).

Tip The small bar marks the leftmost boundary of the notification area. To resize the notification area, rightclick this bar and remove the check from the Lock to Panel menu entry. Then you can click and drag the bar to a different size. This might be handy if the notification area starts to fill up with icons!