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sparql join query explanation hows its working


sparql join query explanation hows its working  using -'hadoop,sparql,bigdata,jena'

My query:

select ?x ?z
where
{
  ?x <http://purl.uniprot.org/core/name> ?y .
  ?x <http://purl.uniprot.org/core/volume> ?z .
  ?x <http://purl.uniprot.org/core/pages> "176-186" .
}


I required to make custom parser for this query.

When I do this query on jena model, it returns one record.
Can anyone explain this query implementation?

I split out this query into three parts:

select ?x ?y where { ?x <http://purl.uniprot.org/core/name> ?y . }

Total Records Found : 3034

select ?x ?z where { ?x <http://purl.uniprot.org/core/name> ?y . ?x <http://purl.uniprot.org/core/volume> ?z . }

 Total Records Found : 2679

select ?x ?z where { ?x <http://purl.uniprot.org/core/name> ?y . ?x <http://purl.uniprot.org/core/volume> ?z . ?x <http://purl.uniprot.org/core/pages> "176-186" . }

 Total Records Found : 1


Please help me to make custom query parser.
    

asked Oct 11, 2015 by yashwantpinge
0 votes
1 view



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