James R. Groff is senior vice president of business strategy at Oracle Corporation. He is a SQL expert whose SQL-oriented software company, TimesTen Performance Software, was acquired by Oracle in 2005. Paul N. Weinberg is senior vice president of NetWeaver MDM at SAP. He is a SQL expert whose SQL-oriented software company, A2i, Inc., was acquired by SAP in 2004. Weinberg is the bestselling author, with James Groff, of the previous editions of this book.