query-c8546ab0a1a819fcddbe8de4c7906914

rq turtle/ttl

Number of values of a property of each instanceHow to get the number of values of a property of an item? Take for example, I would like to know the number of official website for each instance of a programming language (wdt:P31/wdt:P279*). Somehow the following query is not correct.

Use at

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#>
SELECT ?lang (count(?website) as ?count)
WHERE {
        ?lang wdt:P31/wdt:P279* wd:Q9143.
        ?lang wdt:P856 ?website.
        SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
}
GROUP BY ?lang

Query found at

graph TD classDef projected fill:lightgreen; classDef literal fill:orange; classDef iri fill:yellow; v3("?count") v1("?lang"):::projected v2("?website"):::projected a1((" ")) c6(["bd:serviceParam"]):::iri c3(["wd:Q9143"]):::iri c8(["en"]):::literal v1 --"wdt:P31"--> a1 a1 --"wdt:P279"--> c3 v1 --"wdt:P856"--> v2 subgraph s1["http://wikiba.se/ontology#label"] style s1 stroke-width:4px; c6 --"wikibase:language"--> c8 end bind1[/"count(?website)"/] v2 --o bind1 bind1 --as--o v3