David Kreines is the Manager of Database Services for Rhodia, Inc., and author of Oracle SQL: The Essential Reference (O'Reilly Media, Inc., 2000) and coauthor of Oracle in a Nutshell (with Rick Greenwald) (O'Reilly Media, Inc., 2002), Oracle Database Administration: The Essential Reference (with Brian Laskey) (O'Reilly Media, Inc., 1999) and Oracle Scripts (with Brian Lomasky) (O'Reilly Media, Inc., 1998). Dave has worked with Oracle as a developer and database administrator since 1985, on a wide variety of platforms, from PCs to mainframes. He is an Oracle Certified Professional, is certified as a DBA, and has been a frequent contributor to Oracle conferences, user groups, and publications, both in the United States and in Europe. Dave served two terms as president of the International Oracle Users Group -Americas (IOUG-A), and spent ten years on the board of directors.