Question: Give me the total number of employer of the engineers whose one of the employer is McDonnell Aircraft?
SPARQL query: SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/employer> <http://dbpedia.org/resource/McDonnell_Aircraft> . ?x <http://dbpedia.org/ontology/employer> ?uri }
Answer: There are [12] employers of the engineers whose one of the employer is McDonnell Aircraft.