How many {game mode} are to/by {massively multiplayer online game} ?
In a MMO game, how many game modes exist?
How many game modes are by a MMO game?
SELECT ( COUNT ( ?g ) AS ?e ) { ?g property:game_mode resource:massively_multiplayer_online_game }
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/P404> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q862490 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P404 wd:Q862490 }
17