On Thu, Jan 20, 2011 at 19:21, Richard Quadling <rquadl...@gmail.com> wrote:
>> That is terrific, at least the first half. The second half, with the
>> Venn diagrams, is awkward!
> When you get heavily nested data, the adjacent set model (where you
> have a parentid for every uniqueid), you very quickly get into
> complicated logic trying to traverse n-levels. The nested set model is
> specifically built to handle this issue. I'd recommend getting to
> grips with it. It will make finding items belonging to a group (or a
> super group) a LOT easier.
> Especially if you have multiple tag hierarchies.

Is that strategy widely deployed, then? It seems so unruly having to
change on average half the database records for every new leaf.

Dotan Cohen


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