If you're curious about what a data warehouse is, try this wikipedia entry:
http://en.wikipedia.org/wiki/Data_warehouse
That said - this isn't something you just pick up in a day or two. Your best bet in this kind of position is to find a junior position within a group that does Business intelligence or data analysis work, so you can learn from others with lots of experience in this area.
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Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?