Saw you talking about this on our IRC channel. Sorry man, I am not too familiar with Oracle. I know MySQL and SQL syntax so I could help you out with queries and such. I can't recommend a book that I haven't read or dealt with personally, so I am pretty much useless.
In all honesty, I can recommend learning SQL first or at the same time. The "for Dummies" books are quite nice in this area. I have "SQL for Dummies" and it has treated me very well. I am sure there is a book called "Oracle for Dummies." The great things about these books is they assume you know next to nothing, great for beginners.
Sorry I can't help more.
The primary purpose of the DATA statement is to give names to constants; instead of referring to pi as 3.141592653589793 at every appearance, the variable PI can be given that value with a DATA statement and used instead of the longer form of the constant. This also simplifies modifying the program, should the value of pi change.
-- FORTRAN manual for Xerox Computers