Oracle PL/SQL Programming
It's my favorite because it has had more (and more positive) impact on my life than any other book I've ever written or read.
Fortunately, lots of other people like it, too.
To make it as useful as possible, we include lots of scripts demonstrating features of PL/SQL.
You can access those scripts by going to the above link and clicking on Download Example Code or click here for the direct link.