@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix ex: <http://example.com/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
@prefix ql: <http://semweb.mmlab.be/ns/ql#> .
@prefix activity: <http://example.com/activity/> .
@base <http://example.com/base/> .
@prefix d2rq: <http://www.wiwiss.fu-berlin.de/suhl/bizer/D2RQ/0.1#> .

<TriplesMap1>
  a rr:TriplesMap;

  rml:logicalSource [
    rml:source <#DB_source>;
    rr:sqlVersion rr:SQL2008;
    rml:query """
        SELECT Name, COUNT(Sport) as SPORTCOUNT
        FROM Student
        GROUP BY Name
        """ ;
    rml:referenceFormulation ql:CSV
  ];

  rr:subjectMap [ rr:template "http://example.com/resource/student_{name}"; ];
	
    rr:predicateObjectMap
    [ 
      rr:predicate	foaf:name ; 
      rr:objectMap	[ rml:reference "name"; ];
    ];

    rr:predicateObjectMap
    [ 
		rr:predicate	ex:numSport ; 
		rr:objectMap	[ rml:reference "sportcount"; ];
    ].

<#DB_source> a d2rq:Database;
  d2rq:jdbcDSN "CONNECTIONDSN";
  d2rq:jdbcDriver "org.postgresql.Driver";
  d2rq:username "postgres";
  d2rq:password "" .