Hi Brook,
Have a look at Joe Cleko's books SQL for Smarties . He has lots on these
types of relationships IE trees.
Also there are lots of SQL functions examples to answer questions like
Path Enumeration
Finding root and "Leaf " nodes
Subtree deletetion
etc....
IMO His books are a must have for "Real World SQL users" :-)
Checkem' out at :
http://www.amazon.co.uk/exec/obidos/ASIN/1558604324/qid=961587236/sr=1-1/026
-2836789-6296449
http://www.amazon.co.uk/exec/obidos/ASIN/1558603239/qid=961587236/sr=1-3/026
-2836789-6296449
~ JustinMacCarthy
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, June 21, 2000 12:23 PM
Subject: RE: Database Design Question
> The standard way to take care of this is a self-referencing table, and a
> recursive function to bust them out.
>
> ID|Parent_ID
>
> Top levels have an id of 0, and the other rows work well with an
autonumber
> in the id.
>
> If children can have multiple parents, as in a BOM(Bill of Materials)
> problem, you'll need two tables of course.
>
>
> -----Original Message-----
> From: Brook Davies [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, June 20, 2000 6:42 PM
> To: [EMAIL PROTECTED]
> Subject: Database Design Question
>
> I have listings that look like:
>
> 1.0 foobars
> 1.1 foobars the revenge
> 1.1.2 foobars the revenge II
> 1.1.2.1 more foobar specials
> 2.0 brown foobars
> 3.0 green foobars
>
> etc..
>
> What is the best DB design in terms of performance for a classification
> system like this?
>
> Thanks,
> Brook Davies
> MaracasMedia Inc.
>
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