Mastering Oracle PL/SQL isn't a tutorial on how to code PL/SQL. It's designed to show you how to code PL/SQL well. It will show you how to write code that will run quickly and won't break in high load, multiuser environments. It covers the vast array of functionality that PL/SQL provides, including effective handling of relational and abstract data, security, triggers, dynamic web content presentation from within the database, creation of a DBA toolkit, and effective debugging techniques.