The with clause and inline views (in both the select and from clauses) and would cause many problems with anything but a reasonably close match to the SQL engine defined in Parse::RecDescent. I've previously written a tool to cross-reference function and procedure calls across packages which was hard enough to get right, parsing SQL to get a meaningful list of dependent objects would be a whole order of magnitude harder, IMO. I'm not saying it can't be done, I'm just pointing out that just looking for words after "from" wouldn't cut the mustard.
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