Peter,

Don't suppose you can post your schema and some examples of how you  
use it? It sounds very interesting.

best,
-Rob


On Aug 3, 2009, at 8:58 AM, Peter Hunsberger wrote:

> On Sun, Aug 2, 2009 at 11:41 PM, <mike@a...> wrote:
>> Joe Celko's and the other hierarchical processing solutions you  
>> mentioned is
>> to use external programmable hierarchical programming functions and  
>> they
>> also do not handle the necessary multiple node type and multiple data
>> occurences necessary for XML.
>
> Not sure what you mean by "external programmable hierarchical
> programming functions"  You can use set/subset hierarchies with pure
> SQL.  Nothing external is required....?
>
> They can certainly handle multiple node types and multiple data
> occurrences: just map the hierarchy using a table that is pure set /
> subset and use a foreign key from it to a table joining multiple types
> and / or multiple occurences as needed.
>
>> Using the Left Out Join in a hierarhical data
>> modeling fashion allows full multipath hierarchical processing to be
>> transparently performed automatically and correctly including  
>> nonlinear
>> multipath queries. See my DevX ANSI SQL Hierarchical Processing  
>> article at:
>> http://www.devx.com/xml/Article/39183/1954
>>
>
> I read your articles, frankly I don't get it. Like I said, I can't see
> how to manage large tree structures in the way you suggest.  In one
> application we manage about 200 different major tree structures, one
> instance of these has 60,000+ main nodes in it.  These nodes represent
> in the order of 50 major types and probably over 200 subtypes.  The
> tree nodes point to in the order of 300,000 data instances (this
> particular tree is relatively sparsely populated). All this is managed
> with about 10 tables using set / subset.  Any path traversal that I
> need for any use case I've ever seen is realizable in pure ANSI SQL.
> We create XML from these tables, on demand to build navigation menus,
> OWL ontology dumps, and data management screens (which may include
> multiple levels of hierarchy depending on the use case).
>
> What am I missing here?
>
> -- 
> Peter Hunsberger
>
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