query-8b58a43192908cec60d9a15c45284c86

Demonstrates "no value" handling

title: Humans without children (only truthy values)

SELECT ?human ?humanLabel WHERE { ?human wdt:P31 wd:Q5 . #find humans ?human rdf:type wdno:P40 . #with at least one truthy P40 (child) statement defined to be "no value" SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],mul,en" } }

Use at

https://query.wikidata.org/sparql

PREFIX wikibase: <http://wikiba.se/ontology#>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wdno: <http://www.wikidata.org/prop/novalue/>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX bd: <http://www.bigdata.com/rdf#>
#Demonstrates "no value" handling
#title: Humans without children (only truthy values)
SELECT ?human ?humanLabel
WHERE
{
  ?human wdt:P31 wd:Q5 .       #find humans
  ?human rdf:type wdno:P40 .   #with at least one truthy P40 (child) statement defined to be "no value"
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],mul,en" }
}

Query found at

graph TD classDef projected fill:lightgreen; classDef literal fill:orange; classDef iri fill:yellow; v1("?human"):::projected c6(["bd:serviceParam"]):::iri c2(["wd:Q5"]):::iri c4(["wdno:P40"]):::iri c8(["#91;AUTO_LANGUAGE#93;,mul,en"]):::literal v1 --"wdt:P31"--> c2 v1 --"a"--> c4 subgraph s1["http://wikiba.se/ontology#label"] style s1 stroke-width:4px; c6 --"wikibase:language"--> c8 end