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Windows NT Workstation and Server were designed to be secure operating systems. Windows NT Domain security allows for the creation of network accounts on secure servers. These are the only accounts that may be granted network access. To log on to resources located on any computer within a Windows NT Domain, the user must first have a domain account. Remember that users in the Administrators group have a great deal of power and flexibility. For example, they can add other users to the Administrators group and change the password of any existing account (and thus be able to use it for login purposes). In this section, we ll cover some best practices that can be used in networked environments. Although most of this information will pertain to all network operating systems, our focus will be on Windows NT and Windows 2000.

Because SQL/XML is a relatively new standard, vendor implementation support varies. Oracle supports a XMLType data type instead of the XML type. IBM s DB2 UDB supports an XML type, but without the type modifiers. As already mentioned, Microsoft SQL Server supports XML and an XML data type, but in a manner a bit different from the SQL/XML standard. As of version 5.0, MySQL provides no support for XML, but it is a statement of direction for a future release.

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Suppose we want to add a biography of the artist to our artists table that can be displayed on a web page. If the biographical sketch could come from several different sources, and thus be formatted differently depending on the source, XML might be a good way to store the data in our artists table. In the following example, I have added the column to the definition of the ARTISTS table that appeared in 3:

the data types do not match, the DBMS must convert one of them before performing the comparison, and while the work to do this is relatively small, it mounts quickly when it has to be done for each row in a large table Use IN instead of OR when possible The IN operator can be rewritten as a JOIN, but the OR operator often requires multiple queries to be run with the results combined by the DBMS The former is far more ef cient Use GROUP BY instead of DISTINCT In most DBMSs, a GROUP BY is a more ef cient way to eliminate duplicate rows compared with the DISTINCT keyword.

NOTE: This chapter focuses on technical ways to protect information on Windows NT and Windows 2000 OS platforms. We won t cover Windows 95/98 security in depth, because these platforms have not been designed for security. As we ll see later in this chapter, the lack of a secure file system makes it difficult to protect information on Windows 95/98.

CREATE TABLE ARTISTS ( ARTIST_ID INT, ARTIST_NAME VARCHAR(60), ARTIST_DOB DATE, POSTER_IN_STOCK BOOLEAN, ARTIST_BIOGRAPHY XML(DOCUMENT(UNTYPED)) );

An SQL/XML function (also called an XML value function) is simply a function that returns a value as an XML type. For example, a query can be written that selects non-XML data (that is, data stored in data types other than XML) and formats the query results into an XML document suitable for display on a web page or transmission to some other party. Table 18-1 shows the basic SQL/XML functions. There are more functions than those I have listed, and SQL/XML functions can be used in combination to form extremely powerful (if not complicated) queries. Also, the functions available vary across SQL implementations. Let s look at a simple example to clarify how these functions can be used. In this example, I will list the CDs by artist Bonnie Raitt from the PERFORMERS and CD_INVENTORY tables shown in Figure 18-1. Here is the SQL statement, using the XMLELEMENT and XMLFOREST functions:

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