You've wasted your time and money. No any breakthrough is expected in relational databases. Are u planning to work in support or in maintenance of a legacy applications? People are moving from the overpriced database.
If you really want to jump into world of Oracle, download the db and start developing a simple application, like examples in the db.
If you really want to jump into world of Oracle, download the db and start developing a simple application, like examples in the db.