How many {cause of destruction} are to/by {aerial warfare} ?
Did you know the destruction  caused on aerial warfare?
How much destruction has aerial warfare caused?
SELECT ( COUNT ( ?l ) AS ?j ) { ?l property:cause_of_destruction resource:aerial_warfare }
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/P770> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q471145 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P770 wd:Q471145 }
4