How many {crew member} are for {Skylab} ?
Tell me how many members work for Skylab.
How many crew members work for Skylab?
SELECT ( COUNT ( ?j ) AS ?l ) { resource:Skylab property:crew_member(s) ?j }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q190776> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1029> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q190776 wdt:P1029 ?obj }
9