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Partial IP addresses: If this is used, the option applies to everything starting with the given partial IP address For example, 19216800/16 can be rewritten as simply 192168 as well A network in CIDR notation: CIDR notation specifies the number of bits that should be used in the subnet mask For example, 19216800/16 indicates that the setting applies to everything that matches the first two bytes of the IP address This can be rewritten as 19216800/25525500 A network address and a subnet mask This is a network address with the full subnet mask written out (for example 19216800 2552552550)..

Figure 5-4. Using an expression in the GROUP BY clause You use aggregate functions along with the GROUP BY clause to summarize data over groups of rows. Be sure to practice what you have learned by completing Exercise 5-2.

Configuring access restrictions based on IP addresses may be useful if you want to grant access to an internal network and deny access to everyone else (although a firewall is a much better way to do this). For an access control mechanism that s more flexible, it s a good idea to work with user-based access restrictions. In this chapter, you ll learn how to configure simple user-based authentication.

The benefits around a possible substitution of implementation can be overstated; swapping out a database isn t that frequent an occurrence. The real benefit of introducing the DAO layer is the way that it constrains certain types of complexity (database operations) to small classes. This makes debugging much simpler, and this is the advantage of the layered approach in general. A bug can be readily tracked to the layer it originates in (often its characteristics will be such that it is easy to infer its origin), and the limited complexity of the layer then makes analysis of the bug much simpler.

Exercise 5-2

Working with basic authentication is the easiest solution To use this, a simple password file needs to be created with the htpasswd command Basically, this file can be anywhere, but make sure that it s not in a location where other users can read it For example, storing the password file in the document root (or anywhere beneath that) is a very bad idea The default location on Ubuntu Server is the /etc/apache2 directory, and that s a fine place for it If you want to put it somewhere else, make sure that it s readable by the user www-data The first time you use the htpasswd command, make sure that you use the -c option with it to make sure that a new password file is created.

Use the AdventureWorks2008 database to complete the exercise. You can find the solutions in the appendix. 1. Write a query that shows the total number of items ordered for each product. Use the Sales.SalesOrderDetail table to write the query. 2. Write a query using the Sales.SalesOrderDetail table that displays a count of the detail lines for each SalesOrderID. 3. Write a query using the Production.Product table that lists a count of the products in each product line. 4. Write a query that displays the count of orders placed by year for each customer using the Sales.SalesOrderHeader table.