Very situational....
Let me lay out what I *think* your saying your, tell me if I'm right/wrong.
You have a table with 3 (or more, but irelevent) columns. A sample of the
data is as such:
Product | Group | Name
1 | 1 | Full product listing
2 | 1 | Computers
3 | 2 | Motherboards
4 | 2 | Monitors
5 | 3 | Asus
6 | 3 | Tyan
And let's say your in the Asus sub section of motherboards, so you want to
"step up" the ladder, and find the entire sub path your in...
Well, I personally don't see a way to do this right off, what I would end up
doing in this case is redesigning the tables. Use a multiple table
structure that links to each other, so you can use joins to gather
information about categories higher up in the heirarchy.
If I misunderstood, please explain.
----- Original Message -----
From: "Leonard Coonan" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, March 13, 2001 3:52 PM
Subject: Unary Relationship.
> Hi, I was wondering if anyone could help me with some SQL. I have a
product
> group table that has a link to itself to allow me to build a hierarchy of
> products. Each Product has a link/relationship to its parent, so I have
>
> PRODUCT GROUP
> ----------------------------
> PRDGRP_TK Primary Key
> PRDGRP_FK Foreign key of parent product group.
>
> My question is, can I retrieve all parents up the hierarchy using one SQL
> statement. I know I can use my code, (in php in this case) to keep
calling
> an Sql statement and go up one link at a time. But it would be very handy
> to be able to simply return the entire product group structure above a
> particular product group.
>
>
> thanks
>
> len.
>
>
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