I'm not sure if it's relevant to your question
http://www-2.cs.cmu.edu/~cache/pg_graph/
pg_graph provides a way of handling graph-based data structures within
the relational database PostgreSQL. In particular, it provides a convenient
means of inserting graphs as BLOB-like objects in the RDBMS.
Primarily, however, it provides a mechanism for indexing the graphs to
provide efficient means to perform nearest-neighbor queries over
collections of graphs.
On Thu, 2 Jun 2005, Joachim Zobel wrote:
Hi.
I am looking for a way to write a SELECT that finds connectivity
components of a graph or at least for one that given two nodes
determines if there is a path between them. It seems that this is not
possible, no matter what graph representation I choose. Which constructs
from set theory are missing in SQL? Set of all subsets is one I am
missing, or can it be done somehow?
Is anybody else thinking about the limits of SQL? As often I am probably
not the first to ask these questions. Any pointers?
Sincerely,
Joachim
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Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83
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