I think this is soooo system dependent, and that it would be faster consulting your manual. Just as an example, in PostgreSQL you would need to either use "\d $tablename", or you would need to go into system tables such as pg_class, pg_attribute, and pg_type. I know how to do this in Postgres, but this certainly doesn't apply to any other databases.
I'm sure there is a way, but I think you're asking in the wrong place. You should find your manual and look for this information, or ask an oracle users group...
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