query: SELECT name FROM people WHERE people_id NOT IN (SELECT people_id FROM candidate)
question: what are the name persons who never participated that candidate election.
query_toks: SELECT name FROM people WHERE people_id NOT IN ( SELECT people_id FROM candidate )
query_toks_no_value: select name from people where people_id not in ( select people_id from candidate )
question_toks: what are the name persons who never participated that candidate election.