How many {participant of} are for {Ronaldinho} ?
How many people participate in Ronaldinho?
How many participate in Ronaldinho?
SELECT ( COUNT ( ?j ) AS ?g ) { resource:Ronaldinho property:participant_in ?j }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q39444> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1344> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q39444 wdt:P1344 ?obj }
4