How many {developer} are to/by {Panasonic} ?
What's the number of Panasonic developers?
How many developers of Panasonic are there?
SELECT ( COUNT ( ?p ) AS ?z ) { ?p property:developer resource:Panasonic_Corporation }
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/P178> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q53247 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P178 wd:Q53247 }
8