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Can anyone tell me what the 'restrictions' actually are?
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The example also uses bad logic. Logically, a child has at least two parents (biologically) and those two parents could potentially work for the same company. Creating duplicate entries in the Child table would be less effective. I thought hierarchical referred more to a subclass/superclass relationship; e.g. the relationship between person and employee.
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*Added archive https://web.archive.org/web/20081108151540/http://www.kamfonas.com/id3.html to http://www.kamfonas.com/id3.html
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