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Ryan Stephens and Ron Plew are president and vice president of Perpetual Technologies, Inc., (PTI) where their duties include Oracle database administration and consulting and training in Oracle, SQL, and UNIX. They have both been teaching at the college level for more than five years as adjunct professors at Indian University-Purdue University in Indianapolis. They have co-authored STY SQL in 24 Hours, 2/e and 3/e, and STY SQL in 21 Days, 3/e.
Arie D. Jones is Senior SQL Server database administrator and analyst for PTI in Indianapolis. He has written several books and articles pertaining to database related topics, the most recent is SQL Functions Programmer's Reference from Wrox.