can you explain it bit more what exactly you are looking for. If you want to get record from DB (SQL, Oracle etc) using CAML then it will not possible in sharepoint. You can only retrive content form iste through CAML.
Hope it could help
Cheers, Hemendra-MCTS "Yesterday is just a memory,Tomorrow we may never see"
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.