> From: Rob Munn [mailto:[EMAIL PROTECTED] 
> Joe Celko has a great example of tree modelling using nested 
> sets in  "SQL
> for Smarties". In fact, he has a PHP class for doing just 
> this released
> under gpl. Check it out:

I don't know about the PHP class, but I can attest to Joe Celko's tree using
nested sets as a great concept to learn! I use it a lot with hierarchies of
permissions, etc. The SQL For Smarties book is one that makes you just say,
"damn, I thought I knew a lot of SQL"!!

Mike



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