If you work with Oracle PL/SQL, or want to learn, you MUST have this book on your desk, as well as in the bathroom, living room, dining room and in your car!  The author, Steven Feuerstein, has been perfecting this book for many, many years and his witty style along with tons and tons of examples gets my Orgasmic recommendation.  While the Oracle PL/SQL manual is a nice, albeit terse, introduction to PL/SQL, Mr. Feuerstein takes you from simple to advanced in 27 glorious chapters AND it's an O'Reilly book. To order this book from Amazon, click on the following link:  Oracle PL/SQL Programming: Covers Versions Through Oracle Database 11g Release 2 (Animal Guide) .