TOPIC: SQL Queries and Location of Event Information

Hello All -

First off I'm not a mySQL guru - very limited indeed. I need to prepare a query that reports essential this:

Who (3 fields total) has registered and reported these number of items (2 fields total) for a specific event.

I need to know where I find specific information on the users or registrees, and the events.

Is there an explanation/documentation regarding the specific tables dtregister uses and what they contain?

Thanks!

JM