Question: Give me the number of home stadiums of teams managed by John Spencer.
SPARQL query: SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/manager> <http://dbpedia.org/resource/John_Spencer_(Scottish_footballer)> . ?x <http://dbpedia.org/ontology/homeStadium> ?uri  . }
Answer: There are [8] home stadiums of the team managed by John Spencer.