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Listing 11-13. Removing All Leading and Trailing Spaces from the FirstName Values UPDATE Member SET FirstName = RTRIM ( LTRIM (FirstName))

Of the three important technologies, VMware is probably the current market leader, probably because it offers a commercial solution to virtualize many different operating systems. The most important VMware version in the data center is VMware ESX, which offers a tuned Linux kernel that integrates Virtual Machine Manager. However, if you want to use VMware ESX as a virtualization platform today, you ll have to do it by running Ubuntu Server as a virtualized guest operating system within the VMware environment. There s currently no way to combine VMware ESX and Ubuntu Server as a virtualization host platform.

Social network sites are part of a greater movement called web 2.0. The first Internet (web 1.0) offered us mainly static content, provided by the site owner. The user consumed that content typically by using a web browser. Web 1.0 sites included newspapers, magazines, and corporate or e-commerce sites. The user could read the pages, buy something online, and if the site allowed she could post a comment to an existing web page. The user was strictly a consumer. Web 2.0, on the other hand, is a platform to share to share interests, photos, video, status, and any other information that we deem interesting. There is no main publisher, and when there is a centralized authority, its role is mainly to set the rules and enforce them, not to produce content. Think YouTube, Wikipedia, Twitter, and Facebook. Several types of sites are considered part of the Web 2.0, including but not limited to: Wikis: These are sites that allow users to create content in the form of sets of interrelated web pages, often with a common subject. It is well suited for documentation of specific topics and for encyclopedias, the most famous being Wikipedia. Blogs: A blog (short for web log) is a service that allows a user or set of users to post content, forming a web page of continuous posts sorted in chronological order (showing the newest post first). Derivations of the original blog concept are photoblogs and Microblogging sites (which set a size limit for posts). Social networks: These are sites that allow users to create profiles and connect to other users to share information and interests. Those connected users are typically called friends. The content shared is often divided into private and public content, private content being available only through authorized connections.

Ubuntu 10.04 was designed to be social from the start, which means that it integrates with social networks seamlessly. In the first section of this chapter we look at some of the applications you can use for this purpose.

Note In the Xen community, the words host and guest are avoided when discussing operating system.

A more disturbing problem is characters that look like spaces but aren t. This sometimes occurs when data is moved around between various products and different implementations. I actually experienced this when generating and maintaining both an Access and SQL Server version of the tables for this book. All of a sudden, some of my queries to find rows with certain names weren t working. The name fields looked like they had gained some extra trailing spaces, but using trim functions wasn t helping. Eventually, I realized that the extra characters weren t spaces but some other unprintable character. By using a wildcard expression as in Listing 11-10, I managed to retrieve the right rows. Two other data-entry gotchas are the numbers 0 (zero) and 1 (one) entered instead of the letters o and l. You can spend hours trying to debug a query that is looking for John or Bill , but if the underlying data has been mistakenly entered as J0hn or Bi11 , you will search in vain. The moral is that weird things can happen with data values, so when the troubleshooting of your query syntax fails, check the underlying data.