SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/nonFictionSubject> <http://dbpedia.org/resource/Ankh-Morpork_City_Watch> . ?x <http://dbpedia.org/ontology/nonFictionSubject> ?uri }
How many non-fiction subjects are there of the books whose one of the non-fiction subject is Ankh-Morpork City Watch ?
SELECT DISTINCT COUNT ( ?f ) WHERE { ?m property:non_fiction_subject ?f . ?m property:non_fiction_subject resource:Ankh-_Morpork_City_Watch }
68
There are [68] non-fiction subjects of the books whose one of them is Ankh-Morpork City Watch.
In books [68] subjects are there of which is City Watch of Ankh-Morpork.