How many {discovery method} are to/by {Radial velocity} ?
Research concerning radial velocity has been discovered how many times?
How many discoveries have been made concerning radial velocity?
SELECT ( COUNT ( ?g ) AS ?k ) { ?g property:discovery_method resource:radial_velocity }
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/P1046> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q240105 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P1046 wd:Q240105 }
468