I'm in a new group, so, instead of running queries in my old familiar, small, sql server database, I'll be using Oracle 11i. I can get help from co-workers, but, I'd like to be able to start studying and learn some on my own. I've found some ERDs online, some on the TRD and other sites, so, that will help.
So, I guess what I'm looking for are tips for learning, specifically, ad hoc queries, on the main tables like install base, customers, contacts, service contracts. Maybe books, online sites or what ever might help a noob.