Ryan Stephens is President of Perpetual Technologies, Inc., where his duties include Oracle database administration and consulting and training in Oracle, SQL, and UNIX. Ryan has been teaching at the college level for more than five years as adjunct professor at Indiana University-Purdue University in Indianapolis, IN. Ryan is Oracle Certified Professional. Ryan has co-authored: Sams Teach Yourself SQL in 24 Hours, Second Edition and Sams Teach Yourself SQL in 21 Days