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Column constraints restrict (constrain) the values allowed in the table column in some way. (Constraints were introduced in 1.) Technically, the DEFAULT and NULL | NOT NULL clauses are special forms of column constraints, but they are not always implemented in the same way as other column constraints within the DBMS. A column constraint may only reference one column of a table, but there is an easy workaround because any column constraint may be rewritten as a table constraint. (Table constraints are covered later in this chapter.) Column constraints can take any of the following forms: DEFAULT clause An expression that is applied to a column value when a new row is inserted into the table that does not provide a value for the column. The expression can be any valid expression that SQL can understand, such as a constant, an SQL function, or another syntax that yields a proper data value for the column when evaluated by the SQL engine in the DBMS. For example, notice the speci cation of DEFAULT N on the CUSTOMER_HOLD_INDIC column shown in the CUSTOMER_ACCOUNT table. This default will ensure that a newly inserted Customer Account will always get a value of N (not on hold) when the statement inserting the new row either provides no value for the column or speci es the keyword DEFAULT for the column value. Another common use for the default clause is to set dates such as transaction dates to the current date as new rows are inserted. However, the syntax for assigning the current date varies so much across vendor DBMS implementations that I have avoided using it in the sample video store DDL. Here is the SQL syntax and an example of a column with a DEFAULT clause:

You may want to get to your music controls even if your iPhone is locked. Here's how: Just double-click the Home button and the controls for adjusting the music show up on the top of the locked screen. There's no reason to unlock the screen and then go to the Music program to find the controls. In the image to the right, notice that the screen is still locked yet the music controls are now visible along the top. You can pause, skip, go to a previous song, or adjust the volume without actually unlocking the iPhone. NOTE: You ll only see these controls if there is music playing.

$ /opt/apache1.3.9/apachectl help usage: /opt/apache1.3.9/apachectl (start|stop|restart|fullstatus|status|graceful|configtest|help) start stop restart - start httpd - stop httpd - restart httpd if running by sending a SIGHUP or start if not running fullstatus - dump a full status screen; requires lynx and mod_status enabled status - dump a short status screen; requires lynx and mod_status enabled graceful - do a graceful restart by sending a SIGUSR1 or start if not running configtest - do a configuration syntax test help - this screen

To start Apache, you simply need to issue the following command from the same directory:

Listening to Free Internet Radio (Pandora)

To stop the service, you may use the following command from the same directory:

DEFAULT (expression) Example: CUSTOMER_HOLD_INDIC CHAR(1)

While your iPhone gives you unprecedented control over your personal music library, there may be times when you want to just mix it up and listen to some other music. TIP: A basic Pandora account is free and can save you considerable money compared with buying lots of new songs from iTunes. Pandora grew out of the Music Genome Project. This was a huge undertaking. A large team of musical analysts looked at just about every song ever recorded and then developed a complex algorithm of attributes to associate with each song.

33:

If you change the Apache configuration file and need to restart the service so that the server is updated, simply use the following command from the same directory:

NOTE: Pandora may have some competition by the time you read this book. Right now there s one other competitor called Slacker Personal Radio, but there will probably be more. If you want to find more options, try searching the App Store for iPhone Internet Radio. Please also note that Pandora is a US-only application and Slacker available is only in the US and Canada. Spotfly is a similar app for Europe. Hopefully, more options will begin to pop up for international users.

Once Apache is running on port 80, clients will be able to begin requesting HTML pages and other content.