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Joe Celko's Trees and Hierarchies in SQL for Smarties

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In my book SQL For Smarties 2nd edition (Morgan-Kaufmann, 2000),
I wrote a chapter on a programming technique for representing trees and
hierarchies in SQL as nested sets. This technique has become popular enough
that I have spent almost every month since SQL For Smarties was released
explaining the technique in Newsgroups and personal emails. And people who
have used it have been sending me emails with their programming tricks. Oh,
I will still have a short chapter or two on trees in any future edition of SQL for
Smarties, but this topic is worth this short monograph.

The first section of the book is a bit like an introductory college textbook on
graph theory, so you might want to skip over it, if you are current on the
subject. If you are not, then the theory there will explain some of the
constraints that appear in the SQL code later. The middle sections deal with
programming techniques and the end sections deal with related topics in
computer programming.
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