Querying RDF Data Cubes with SPARQL

[@mostafabankesli5451]

Man, u just made my day

[@avisheakdasshomrat7321]

How can we query observations from multiple dataset? Like "?sub a qb:Observation ; qb:dataSet or ."

[@giantglobalgraph]

I don't use RDF Data Cube Vocabulary anymore as we created our own model (cube.link). This is an example of how I join two cubes in the cube.link vocabulary:
--
SELECT DISTINCT ?dimension0 ?dimension1 ?dimension2 ?dimension3 ?dimension4 WHERE {
?observationSet0 .
?observationSet0 ?source0 .
?observationSet1 .
?observationSet1 ?source1 .
?source0 ?dimension0 .
?source0 ?dimension1 .
?source1 ?dimension1 .
?source0 ?dimension2 .
?source1 ?dimension2 .
?source1 ?dimension3 .
?source1 ?dimension4 .
FILTER ( ?dimension1 IN ( ))
FILTER ( ?dimension2 IN ( ))
}
GROUP BY ?dimension0 ?dimension1 ?dimension2 ?dimension3 ?dimension4
--
So you simply create two sources and join the dimensions on those keys you want to join.