query-a5bb2053fdfbd62eaac4041a1487105e

rq turtle/ttl

Main subjects of scientific papers #Now has performance problems SELECT ?item ?itemLabel ?subject ?subjectLabel WHERE { ?item wdt:P31 wd:Q13442814 . ?item wdt:P921 ?subject . SERVICE wikibase:label { bd:serviceParam wikibase:language "en" } }

Use at

https://query.wikidata.org/sparql

PREFIX wikibase: <http://wikiba.se/ontology#>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX bd: <http://www.bigdata.com/rdf#>
#Main subjects of scientific papers
  #Now has performance problems
  SELECT ?item ?itemLabel ?subject ?subjectLabel WHERE {
  ?item wdt:P31 wd:Q13442814 .
  ?item wdt:P921 ?subject .
   SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
}

Query found at

https://www.wikidata.org/wiki/User:Charles_Matthews/Queries

graph TD classDef projected fill:lightgreen; classDef literal fill:orange; classDef iri fill:yellow; v1("?item"):::projected v2("?subject"):::projected c2(["wd:Q13442814"]):::iri c5(["bd:serviceParam"]):::iri c7(["en"]):::literal v1 --"wdt:P31"--> c2 v1 --"wdt:P921"--> v2 subgraph s1["http://wikiba.se/ontology#label"] style s1 stroke-width:4px; c5 --"wikibase:language"--> c7 end