Re: query

[Rafiq]

Sample data

<http://www.Department4.University3.edu>     a :Department .
    <http://www.Department4.University3.edu>     :name "Department4" .

    <http://www.Department4.University3.edu> :subOrganizationOf 
<http://www.University3.edu> .

<http://www.Department4.University3.edu/AssistantProfessor0> a 
:AssistantProfessor .

<http://www.Department4.University3.edu/AssistantProfessor0> 
:doctoralDegreeFrom <http://www.University2980.edu> .

<http://www.Department4.University3.edu/AssistantProfessor0> 
:emailAddress "assistantprofess...@department4.university3.edu" .

<http://www.Department4.University3.edu/AssistantProfessor0> 
:mastersDegreeFrom <http://www.University2549.edu> .

<http://www.Department4.University3.edu/AssistantProfessor0> :name 
"AssistantProfessor0" .

<http://www.Department4.University3.edu/AssistantProfessor0> 
:researchInterest "Research38" .

<http://www.Department4.University3.edu/AssistantProfessor0> :teacherOf 
<http://www.Department4.University3.edu/Course29> .

<http://www.Department4.University3.edu/AssistantProfessor0> :teacherOf 
<http://www.Department4.University3.edu/Course30> .

<http://www.Department4.University3.edu/AssistantProfessor0> :teacherOf 
<http://www.Department4.University3.edu/GraduateCourse29> .

<http://www.Department4.University3.edu/AssistantProfessor0> :teacherOf 
<http://www.Department4.University3.edu/GraduateCourse30> .

<http://www.Department4.University3.edu/AssistantProfessor0> :telephone 
"xxx-xxx-xxxx" .

<http://www.Department4.University3.edu/AssistantProfessor0> 
:undergraduateDegreeFrom <http://www.University10318.edu> .

<http://www.Department4.University3.edu/AssistantProfessor0> :worksFor 
<http://www.Department4.University3.edu> .



On 01/07/2014 07:35 PM, Rafiq wrote:
Joshua, thanks for the response...and I am aware what you said.

I expect an answer because I received answer of this query using other 
triplestores.
I generated this dataset using LUBM data generator. The dataset
contains 153 million triples.



On 01/07/2014 07:17 PM, Joshua TAYLOR wrote:
  Just because the query is legal SPARQL doesn't mean that it it matches
any of your data?  I can send this query to DBpedia, and I get no
results, not because there's no such person, but because DBpedia
doesn't include any data about this person:

select ?person where ui
   ?person a dbpedia-owl:Person ;
           foaf:name "Rafiq"@en ;
}

What's your data?  Why do you expect your query to work?

On Tue, Jan 7, 2014 at 1:00 PM, 
Rafiq<akm-rafiqul.ha...@univ-lyon1.fr>  wrote:
Hi,

Here is my query

SELECT ?x ?y WHERE {
     ?x<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Student> .
     ?y<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Course> .
<http://www.Department0.University0.edu/AssociateProfessor0>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#teacherOf> ?y .
?x<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#takesCourse> ?y
}

When I execute it I get the answer below:

{
   "head": {
     "vars": [ "x" , "y" ]
   } ,
   "results": {
     "bindings": [

     ]
   }
}

I could not find any valid reason why it returns this answer. I 
validated
the query using online validator, its absolutely fine.
  Then I modify the query.. the query turns into the following:

'SELECT  ?x ?y WHERE {?x a ?Student . ?y a ?Course . 
?AssociateProfessor0
?teacherOf ?y . ?x ?takesCourse ?y}'

I left it two days, it did not return anything because the query 
could not
be parsed. Where did I do mistake if I did any?


I have a few modified queries with single variable worked fine 
however, this
one did not. I want to believe
the number of variable when is two (X, Y) creating a problem?


For your information, I am using Fuseqi server with TDB store.

Regards,
Rafiq