How many {connector} are to/by {USB-C} ?
What is the number of connections you can have with USB-C?
how many connections do you have with USB-C?
SELECT ( COUNT ( ?r ) AS ?z ) { ?r property:connector resource:USB-C }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2935> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q20026619 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P2935 wd:Q20026619 }
30