query-ec876b507141ce45f633d683d20436a5

rq turtle/ttl

One and only one external identifierHi ! ). How can I got all the items with ONLY this external identifier and no other external identifiers ? How can I got all the items who have only a specific number of external identifiers values ? (P2930)INSPIRE-HEP author ID only have one external identifier ((Q98442698)Sam James Harper Is it possible to create a query where I can get the items with one and only one, specific or not, external identifier ? As an example, 11:06, 14 April 2024 (UTC)) talk (Simon VilleneuveThank you ! I think this should work:

Use at

PREFIX wikibase: <http://wikiba.se/ontology#>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX bd: <http://www.bigdata.com/rdf#>
SELECT ?item ?itemLabel ?id WHERE {
  ?item wikibase:identifiers 1 .
  ?item wdt:P2930 ?id
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}

Query found at

graph TD classDef projected fill:lightgreen; classDef literal fill:orange; classDef iri fill:yellow; v2("?id"):::projected v1("?item"):::projected c2(["1^^xsd:integer"]):::literal c5(["bd:serviceParam"]):::iri c7(["#91;AUTO_LANGUAGE#93;,en"]):::literal v1 --"wikibase:identifiers"--> c2 v1 --"wdt:P2930"--> v2 subgraph s1["http://wikiba.se/ontology#label"] style s1 stroke-width:4px; c5 --"wikibase:language"--> c7 end