I just lined up a job for this summer working for a large investment firm, and need to brush up on my SQL. I've had a class a few years ago which revolved around Oracle, and also some experience in a class two semesters ago. Although I've used it, I'm a bit rusty and can't say I remember a ton. I was wondering if anyone has any good eBooks,tutorials, tips, etc. that they could recommend for me. I would appreciate the help.