How many {diocese} are to/by {Russian Orthodox Church} ?
How many diocese are recorded as members of the Russian Orthodox Church?
How many diocese are there in the Russian Orthodox Church?
SELECT ( COUNT ( ?r ) AS ?h ) { ?r property:diocese resource:Russian_Orthodox_Church }
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/P708> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q60995 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P708 wd:Q60995 }
33