query-5a3b83ec830c78d72a2d67fa605ed645
SPARQL - Städte in den USA, deren Einwohnerzahl per Referenz belegt ist https://en.wikibooks.org/wiki/SPARQL/WIKIDATA_Qualifiers,_References_and_RanksSiehe: The prefix pr: within the reference node retrieves the reference information. The prov:wasDerivedFrom within the statement node points to a new reference node. The prefix ps: within the statement node retrieves the object. The prefix p: points not to the object, but to a statement node. This node then is the subject of other triples.
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 ps: <http://www.wikidata.org/prop/statement/>
PREFIX prov: <http://www.w3.org/ns/prov#>
PREFIX pr: <http://www.wikidata.org/prop/reference/>
PREFIX p: <http://www.wikidata.org/prop/>
PREFIX bd: <http://www.bigdata.com/rdf#>
SELECT ?town ?townLabel ?anzahl ?ref ?refLabel ?county ?countyLabel
WHERE
{
?town wdt:P31 wd:Q1093829 . # ?town ist eine City in den Vereinigten Staaten
?town wdt:P131 ?county . # ?town liegt in der Verwaltungseinheit ?county
?town p:P1082 ?statement . # ?town hat ?statement
?statement ps:P1082 ?anzahl . # ?statement hat Einwohner ?anzahl
?statement prov:wasDerivedFrom ?refnode. # points to a new reference node.
?refnode pr:P248 ?ref . # ?refnode hat die Referenz ?ref
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
Query found at
graph TD
classDef projected fill:lightgreen;
classDef literal fill:orange;
classDef iri fill:yellow;
v4("?anzahl"):::projected
v2("?county"):::projected
v6("?ref"):::projected
v5("?refnode")
v3("?statement")
v1("?town"):::projected
c2(["wd:Q1093829"]):::iri
c9(["bd:serviceParam"]):::iri
c11(["en"]):::literal
v1 --"p:direct/P31"--> c2
v1 --"p:direct/P131"--> v2
v1 --"p:P1082"--> v3
v3 --"p:statement/P1082"--> v4
v3 --"prov:wasDerivedFrom"--> v5
v5 --"p:reference/P248"--> v6
subgraph s1["http://wikiba.se/ontology#label"]
style s1 stroke-width:4px;
c9 --"wikibase:language"--> c11
end