query: SELECT count(*) FROM course WHERE course_id NOT IN (SELECT course_id FROM prereq)
question: Counting a number course them prerequisite them.
query_toks: SELECT count ( * ) FROM course WHERE course_id NOT IN ( SELECT course_id FROM prereq )
query_toks_no_value: select count ( * ) from course where course_id not in ( select course_id from prereq )
question_toks: Counting a number course them prerequisite them.