How many {musical conductor} are to/by {Zubin Mehta} ?
Zubin Mehta had what number of musical conductions?
how many musical conductions are by zubin mehta?
SELECT ( COUNT ( ?r ) AS ?i ) { ?r property:musical_conductor resource:Zubin_Mehta }
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/P3300> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q157635 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P3300 wd:Q157635 }
6