How many {emulates} are to/by {PlayStation} ?
How does PlayStation do it's emulation?
How does it emulates in the {PlayStation} ?
SELECT ( COUNT ( ?o ) AS ?s ) { ?o property:emulates resource:PlayStation }
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/P4043> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q10677 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P4043 wd:Q10677 }
10