How many {shape} are to/by {circle} ?
How many shapes have a circle?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P1419 wd:Q17278 }
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/P1419> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q17278 .
} 

How many shapes have a circle?
 

 