query: SELECT name FROM instructor WHERE id NOT IN (SELECT id FROM teaches WHERE semester  =  'Spring')
question: Find the names of instructors which didn't each no courses in any Spring semester.
query_toks: SELECT name FROM instructor WHERE id NOT IN ( SELECT id FROM teaches WHERE semester = 'Spring ' )
query_toks_no_value: select name from instructor where id not in ( select id from teaches where semester = value )
question_toks: Find the names of instructors which didn't each no courses in any Spring semester.