Re: trees, trees, trees
From: Gerard H. Pille <ghp_at_skynet.be>
Date: Thu, 21 Jun 2012 21:34:59 +0200
Message-ID: <4fe37745$0$3121$ba620e4c_at_news.skynet.be>
geos wrote:
> Gerard H. Pille wrote:
>> Use a tree walk (hierarchical query) to find the parent, if any, and another to find all
>> children of that parent.
>
> closer inspection of the data reveals that those are not trees or hierarchies but oriented
> graphs, some without root node. this makes it more complicated.
>
Date: Thu, 21 Jun 2012 21:34:59 +0200
Message-ID: <4fe37745$0$3121$ba620e4c_at_news.skynet.be>
geos wrote:
> Gerard H. Pille wrote:
>> Use a tree walk (hierarchical query) to find the parent, if any, and another to find all
>> children of that parent.
>
> closer inspection of the data reveals that those are not trees or hierarchies but oriented
> graphs, some without root node. this makes it more complicated.
>
I quote: "columns col1 and col2 are in parent-child relation. from the above table one can conclude the following three hierarchies"
This was wrong, then? In which case, please provide a correct example of your data. Received on Thu Jun 21 2012 - 14:34:59 CDT