Count the journals in the field of Philosophy.
SELECT DISTINCT COUNT(?uri) WHERE {?uri <http://dbpedia.org/property/discipline> <http://dbpedia.org/resource/Philosophy>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/AcademicJournal>}
Philosophy