This Thursday (November 5th, 10:00 UTC - note the different time for this session!), Arjen Lentz of Open Query will present the brand new GRAPH computation engine for MySQL.
From the abstract: Most of us have had to deal with hierarchies
(trees) and graphs (such as friend-of-a-friend style problems),
and have thus learn that this is -at best- a bit of a monster to
do in an SQL/RDBMS. Until now. The GRAPH engine (GPLv2 licensed)
is a MySQL storage engine allowing hierarchies and more complex
graph structures to be handled in a relational fashion. In a
nutshell, tree structures and friend-of-a-friend style searches
can now be done using standard SQL syntax, and results joined
onto other tables. http://openquery.com/graph
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