How many {member of the crew of} are for {Edward Smith} ?
How many people did Edward Smith have on his crew?
How many people were on Edward Smith's crew?
SELECT ( COUNT ( ?a ) AS ?o ) { resource:Edward_Smith property:member_of_the_crew_of ?a }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q215786> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P5096> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q215786 wdt:P5096 ?obj }
7