> You may want to try the famous Joe Celko's approach that he described in > this book: > > Book review: SQL for Smarties > http://www.phpclasses.org/products.html/id/1558605762.html >
Also, be sure to check our the PEAR classes DB_NestedSet/MDB_NestedSet which will make using this model much, much easier.
But do buy the book, because it's awesome.
Cheers, Hans
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