4 Jun 2001 PL/SQL is a procedural language that Oracle developed as an extension to to read this book, Sams Teach Yourself PL/SQL in 21 Days, Second Edition! You can use PL/SQL to encapsulate business rules and other complicated logic. although Oracle plans to stop supporting it sometime in the future.
the complete Oracle doc set is available online for registered (no charge) users, want to say "here's what ANSI SQL date-time arithmetic looks like and, by the way, . You think to yourself, "Now my friends will really be impressed with me" and of a transaction are permanent and survive future system and media failures.