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Date: 2015-01-09T14:47:29-07:00
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On 09-Jan-15 14:33, Randy Brukardt wrote:
> I haven't any clue as to what you are talking about. Visiblity information
> is tree-structured, and it is not possible to map trees sensibly into the
> flat tables required by relational technology. Doing so distorts the problem
> (as Dmitry notes).

It actually is possible to store a tree structure in a "flat table" -- 
see recursive queries. -- 
http://en.wikipedia.org/wiki/Hierarchical_and_recursive_queries_in_SQL