Re: Hierarchical queries

Hello Oleg and thanks for the link, but i could not understand how to
get path from one point of the tree to another?
Anyway thanks :)

Best regards,
Anton
OB> Look at contrib/ltree
OB> http://www.sai.msu.su/~megera/postgres/gist/ltree

OB> Oleg
OB> On Fri, 9 Jan 2004 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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OB> Regards,
OB> Oleg
OB> _____________________________________________________________
OB> Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
OB> Sternberg Astronomical Institute, Moscow University (Russia)
OB> Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
OB> phone: +007(095)939-16-83, +007(095)939-23-83

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