I've seen most DBAs come from two directions: system administrators that take care of databases, and developers who take care of databases. I've rarely met a "trained" DBA - one who has only ever worked with databases.
I think this is a great thing. It means that the DBA has either good hardware and system information, good development experience, or both. But there is a danger...
The danger is that the DBA might know advanced topics, but sometimes not the basics. There are places that can help, of course - like here at InformIT. You've got my site, and books like this one: SQL Fundamentals, 3rd Edition by John J. Patrick. Check it out here - I've found it pretty useful.
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