Melanie Caffrey is a senior development manager for Oracle Corporation, providing front-end and back-end Oracle solutions for the business needs of various clients.  She is co-author of several technical publications including Expert PL/SQL Practices for Oracle Developers and DBAs and Expert Oracle Practices:  Oracle Database Administration from the Oak Table, (Apress), as well as Oracle Web Application Programming for PL/SQL Developers and The Oracle DBA Interactive Workbook, (Prentice Hall) and she writes the SQL 101 series of articles for Oracle Magazine.  She instructed students in Columbia University’s Computer Technology and Applications program in New York City, teaching advanced Oracle database administration and PL/SQL development, and she is a frequent Oracle conference speaker.