Hi John, Thanks for the explanations. I am just surprised that the queries you sent me do not work with other public endpoints out there; for e.g., DBpedia.
Best, Ghislain > Le 20 avr. 2017 à 18:27, John Snelson <[email protected]> a écrit : > > Your query asked for all quads from the database, and then returned the > distinct graph values from them. The query I gave you simply returns the > names of all graphs - whether they contain triples or not. The latter is a > simple scan of the collection lexicon, where as the former involves reading > all triples in the database and joining them against the collection lexicon > to find the graphs they are in. > > John > > On 20/04/17 17:11, Ghislain Atemezing-Pro wrote: >> Thanks John! It works. >> But is there any rationale behind the use of those queries instead of the >> one I was using? >> >> Best, >> Ghislain >> >> Le jeu. 20 avr. 2017 à 18:00, John Snelson <[email protected] >> <mailto:[email protected]>> a écrit : >> Try this: >> >> select ?g { graph ?g {} } >> >> or even this: >> >> select (count(?g) as ?count) { graph ?g {} } >> >> John >> >> >> On 20/04/17 16:46, Ghislain Atemezing-Pro wrote: >>> Hi all, >>> I am trying to make some basic statistics using SPARQL queries on my >>> endpoint backed by MarkLogic. >>> Today, I just wanted to retrieve the number of named graphs with the >>> following query: >>> select distinct ?g where { >>> graph ?g { >>> ?s ?p ?o >>> } >>> } >>> >>> I realize that the operation works fine when I limit to 2 (why?) and then >>> for the rest, I have a time exceed limit. >>> >>> Did someone also experience this issue before? >>> >>> Thanks in advance. >>> Best, >>> Ghislain >>> -- >>> -------------------------------------------- >>> Ghislain A. Atemezing, Ph.D >>> R&D Engineer SemWeb >>> @ Mondeca, Paris, France >>> Labs: http://labs.mondeca.com <http://labs.mondeca.com/> >>> Tel: +33 (0)1 4111 3034 <tel:+33%201%2041%2011%2030%2034> >>> Web: www.mondeca.com <http://www.mondeca.com/> >>> Twitter: @gatemezing >>> About Me: http://atemezing.org <http://atemezing.org/> >>> >>> >>> >> >>> _______________________________________________ >>> General mailing list >>> [email protected] <mailto:[email protected]> >>> Manage your subscription at: >>> http://developer.marklogic.com/mailman/listinfo/general >>> <http://developer.marklogic.com/mailman/listinfo/general> >> >> >> -- >> John Snelson, Principal Engineer http://twitter.com/jpcs >> <http://twitter.com/jpcs> >> MarkLogic Corporation http://www.marklogic.com >> <http://www.marklogic.com/>_______________________________________________ >> General mailing list >> [email protected] <mailto:[email protected]> >> Manage your subscription at: >> http://developer.marklogic.com/mailman/listinfo/general >> <http://developer.marklogic.com/mailman/listinfo/general> >> -- >> -------------------------------------------- >> Ghislain A. Atemezing, Ph.D >> R&D Engineer SemWeb >> @ Mondeca, Paris, France >> Labs: http://labs.mondeca.com <http://labs.mondeca.com/> >> Tel: +33 (0)1 4111 3034 >> Web: www.mondeca.com <http://www.mondeca.com/> >> Twitter: @gatemezing >> About Me: http://atemezing.org <http://atemezing.org/> >> >> >> >> _______________________________________________ >> General mailing list >> [email protected] <mailto:[email protected]> >> Manage your subscription at: >> http://developer.marklogic.com/mailman/listinfo/general >> <http://developer.marklogic.com/mailman/listinfo/general> > > > -- > John Snelson, Principal Engineer http://twitter.com/jpcs > <http://twitter.com/jpcs> > MarkLogic Corporation http://www.marklogic.com > <http://www.marklogic.com/>_______________________________________________ > General mailing list > [email protected] > Manage your subscription at: > http://developer.marklogic.com/mailman/listinfo/general -------------------------------------------- Ghislain A. Atemezing, Ph.D R&D Engineer SemWeb @ Mondeca, Paris, France Labs: http://labs.mondeca.com <http://labs.mondeca.com/> Tel: +33 (0)1 4111 3034 Web: www.mondeca.com <http://www.mondeca.com/> Twitter: @gatemezing About Me: https://w3id.org/people/gatemezing <https://w3id.org/people/gatemezing>
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