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How to: MySQL Delete Column

How do I delete a column from an existing MySQL table using UNIX / Windows / Linux mysql command line utility sql syntax?
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Q. I was reading this article and wanted to try out KVM, XEN, VMWare and VirtualBox simultaneously on my desktop system with 2GB RAM? Why I'm not able to use run multiple virtualization technologies simultaneously under Ubuntu Linux? Can a powerful Linux server run multiple virtualization technologies simultaneously?
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Linux / UNIX: Ping a Block of Hosts (netblock)

Q. How do I ping a block of hosts such as 192.168.1.0/24?
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Domain Redirection Using a PHP Script

Q. How do I redirect my domain name using a php server side scripting under Apache web server?
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Q. I know how to delete a file securely using GNU/Linux and Open source tools under Linux. I'm looking for DoD 5520.22-M or NNSA NAP-14.x.secure compliant delete utility under Windows. How do I delete a file permanently under Windows XP or Server operating system with NTFS; so that no one can retrieve my data?
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Question: How do I detect a DDOS (Distributed denial of service) / DOS attack on a Windows Server 2003 / 2000 / 2008? Can I use Linux netstat command syntax to detect DDoS attacks?
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PHP Find / Extract Substrings

Q. How do I find out if a string stored in a variable contains a particular substring using PHP? How do I find out (extract) first 5 character of a particular string using Apache and PHP?
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