How many {participant} are for {October Revolution} ?
Which is the number of participants for the October Revolution?
There were many participants for the October Revolution.
SELECT ( COUNT ( ?o ) AS ?q ) { resource:October_Revolution property:participant ?o }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q42976> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P710> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q42976 wdt:P710 ?obj }
8