Allen G. Taylor is a 30-year veteran of the computer industry and the author of more than 40 books, including previous editions of SQL For Dummies and SQL All-in-One For Dummies. Richard Blum has more than 30 years of experience in the IT industry as a systems and network administrator. He is author of Linux All-in-One For Dummies 7th Edition, and PHP, MySQL, & JavaScript All-in-One For Dummies.