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When querying for data, the database can perform calculations on the data before returning it. You saw such an example earlier in the chapter when COUNT(*) was used to count the number of family members for each lastname. There are a whole range of mathematical functions available in SQL. Some of the most common include SUM, MIN, and MAX, which are used to summarize the values of a column or to get the minimum or maximum value. These functions provide you with a powerful tool. When used in SELECT statements, it is possible to combine these functions with GROUP BY clauses to calculate results based on groups of rows. The results from these calculations can be combined using normal arithmetic operations such as +, -, *, and /. The following statement uses the SUM function, division, and COUNT(*) to calculate the average annual salary for each family: SELECT names.lastname, SUM(salaries.annual)/COUNT(*) AS 'Average', MIN(salaries.annual) AS 'Minimum', MAX(salaries.annual) AS 'Maximum' FROM names LEFT JOIN salaries ON names.id = salaries.id GROUP BY names.lastname Because you do a left join, the family members that do not have an income will be included in the COUNT(*), but not in the functions summarizing and picking out the minimum and maximum values. This means that the minimum salary for those named Doe stays at 900,

Really Simple Syndication (RSS) is one of the key technologies that have freed customer and vendor data. RSS is a web-feed format used to publish frequently updated content such as blog entries, news headlines, or podcasts. An RSS document, which is called a feed, web feed, or channel, contains either a summary of content from an associated web site or the full text. Users can use RSS readers on the Web or on the desktop to subscribe to the feed to receive any updates. Based on XML and transported on HTTP, RSS has become a standard for publishing text, video, and audio. The name Atom applies to a pair of related standards. The Atom Syndication Format is an XML language used for web feeds, while the Atom Publishing Protocol (APP for short) is a simple HTTP-based protocol for creating and updating Web resources.

0', 56305) The server ('127001', 1060) says 'Your data was 18 bytes' Over in the server s command window, you should see it reporting each connection that it serves: The client at ('127001', 41201) says, 'This is my message' The client at ('127001', 59490) says, 'This is my message' Although the client code is slightly simpler than that of the server there are only two substantial lines of code it introduces several new concepts First, the client takes the time to attempt a getsockname() before any address has been assigned to the socket This lets us see that both IP address and port number start as all zeroes a new socket is a blank slate.

but the average salary is calculated at 800. The complete results from the statement can be seen in the following table:

Then the client calls sendto() with both a message and a destination address; this simple call is all that is necessary to send a packet winging its way toward the server! But, of course, we need an IP address and port number ourselves, on the client end, if we are going to be communicating So the operating system assigns one automatically, as you can see from the output of the second call to getsockname() And, as promised, the client port numbers are each from the IANA range for ephemeral port numbers (at least they are here, on my laptop, under Linux; under a different operating system, you might get different results) Since the client knows that he is expecting a reply from the server, he simply calls the socket s recv() method without bothering with the recvfrom() version that also returns an address.

It is easy to let the database perform lots of interesting functions on your data, which is both good and bad. The potentially negative consequence can be a heavier workload on a central server. The benefits are that less data is sent over the network and that the client code is less complex.

Qt s classes for handling and interfacing databases can be split into three groups. The first layer is based around a set of database drivers, which make it possible to access different types of database servers using Qt. The second layer handles connections to databases, queries, and their results, as well as error messages from the database servers. This layer is based on the driver layer because a driver is required to connect to a database. The third layer, which is called the user interface layer, offers a set of models for use with Qt s model view framework.

As you can see from their output, both the client and the server are successfully seeing each other s messages; each time the client runs, a complete round-trip of request and reply is passing between two UDP sockets Success!.

JavaScript Object Notation (JSON) is a lightweight computer data interchange format. It is a text-based, human-readable format for representing objects and other data structures and is mainly used to transmit such structured data over a network connection (in a process called serialization). JSON finds its main application in Ajax web application programming, as a simple alternative to using XML for asynchronously transmitting structured information between client and server.

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