Re: Hierarchical queries

There's a patch to mimic Oracle's CONNECT BY queries. You can get it
at the Postgres Cookbook site:

http://www.brasileiro.net/postgres/cookbook.

(although it seems to be down at the moment...)

On Jan 9, 2004, at 2:05 PM, Anton(dot)Nikiforov(at)loteco(dot)ru wrote:

> Hello everybody!
>
> Does someone know how to build hierarchical queries to the postgresql?
>
> I have a table with tree in it (id, parent)
> and need to find a way from any point of the tree to any other point.
> And i would like to have a list of all steps from point A to point B
> to make some changes on each step (this is required by the algorythm).
>
> Here is an example:
> treetable (where tree is stored):
> id parent data
> int4 int4 varchar(255)
> 0 0 root
> 1 0 root's chield 1
> 2 0 root's chield 2
> 3 1 root's chield 1 chield 1
> 4 1 root's chield 1 chield 2
> 5 2 root's chield 2 chield 1
> 6 2 root's chield 2 chield 2
>
> And i want to get something like this:
> start point "root's chield 2 chield 2"
> finish "root's chield 1 chield 1"
>
> And the result i need:
> id parent data
> 6 2 root's chield 2 chield 2
> 2 0 root's chield 2
> 0 0 root
> 1 0 root's chield 1
> 4 1 root's chield 1 chield 2
>
> i know that it is possible in Oracle but what about postgres?
>
> Best regards,
> Anton Nikiforov
>
>
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