How many {designed by} are to/by {Isambard Kingdom Brunel} ?
What is the number of things Isambard Kingdom Brunel Designed?
How many things did Isambard Kingdom Brunel design?
SELECT ( COUNT ( ?n ) AS ?s ) { ?n property:designed_by resource:Isambard_Kingdom_Brunel }
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/P287> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q207380 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P287 wd:Q207380 }
8