On 5/5/17 5:29 PM, S.M.Shamimul Hasan wrote: > Hello, > > I am trying to run the following query on the Virtuoso SPARQL endpoint > to calculate the path between nodes. However, it is giving me > following error. Could you please let me know how to fix it? BTW the > query works fine for the Jena TDB. However, I want to use Virtuoso > triplestore because it contains all of my datasets. > > Query: > --------- > PREFIX fused:<http://test.edu/vocab/> > > select ?super ?sub (count(?mid) as ?distance) from > <http://test.edu/example/replicate9/> { > ?mid fused:getInfectedBy* ?super. > ?sub fused:getInfectedBy+ ?mid. > } > group by ?super ?sub > order by ?super ?sub > > Error: > -------- > Virtuoso 37000 Error TR...: Query contains a transitive derived table > but neither end of it is bound by equality to other columns or parameters. > > Thanks a lot. > > Sincerely, > S.M.Shamimul Hasan
## Fails (correctly so) with Transitivity error; Virtuoso 37000 Error TR...: Query contains a transitive derived table but neither end of it is bound PREFIX fused:<http://test.edu/vocab/> SELECT ?super ?sub (count(?mid) as ?distance) WHERE { ?mid fused:getInfectedBy* ?super. ?sub fused:getInfectedBy+ ?mid. } GROUP BY ?super ?sub ORDER BY ?super ?sub LIMIT 1 ## Workaround using a sub-query PREFIX fused: <http://test.edu/vocab/> SELECT SAMPLE(?t) ?super ?sub (count(?mid) as ?distance) WHERE { { SELECT distinct ?super WHERE { ?x fused:getInfectedBy ?super } } ?mid fused:getInfectedBy* ?super. ?sub fused:getInfectedBy+ ?mid. } GROUP BY ?super ?sub ORDER BY ?super ?sub LIMIT 1 You can copy and paste each to the SPARQL endpoint at http://linkeddata.uriburner.com/sparql or even http://dbpedia.org/sparql. In either case, the second query will return an empty solution as solution proof. -- Regards, Kingsley Idehen Founder & CEO OpenLink Software (Home Page: http://www.openlinksw.com) Weblogs (Blogs): Legacy Blog: http://www.openlinksw.com/blog/~kidehen/ Blogspot Blog: http://kidehen.blogspot.com Medium Blog: https://medium.com/@kidehen Profile Pages: Pinterest: https://www.pinterest.com/kidehen/ Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen Twitter: https://twitter.com/kidehen Google+: https://plus.google.com/+KingsleyIdehen/about LinkedIn: http://www.linkedin.com/in/kidehen Web Identities (WebID): Personal: http://kingsley.idehen.net/dataspace/person/kidehen#this : http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
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