I've just been tasked by the boss to start investigating SQL databases. Learn about the various flavors (MySQL, M$Sql, Oracle, Informix, etc), the differences, their strengths and weaknesses: the basic fact-finding mission.

Joy. Apparently since I knew what SQL stood for, I'm the man. It seems that management is tired of Access running in the various departments, and have decided that a centralized database would be better for all concerned (can't argue that point).

Anyway, if anyone has some good sites on the subject of SQL databases, I would appreciate a link or two. I'm especially looking for general discussions the basics, comparisons between flavors if possible. Perhaps some mailing lists? Just needing some good places to get started.