Question: Which univeristy has more than 18657 Postgraduates and was the alma mater of Charles Richard Drew?
Answer(s):
answer: Columbia University

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.018t67)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.018t67 ns:people.person.education ?y .
?y ns:education.education.institution ?x .
?x ns:common.topic.notable_types ns:m.01y2hnl .
?x ns:education.university.number_of_postgraduates ?c .
?c ns:measurement_unit.dated_integer.number ?num .
FILTER (xsd:integer(?num) > 18657) . 
}