query: SELECT DISTINCT zip_code FROM weather EXCEPT SELECT DISTINCT zip_code FROM weather WHERE max_dew_point_f  >=  70
question: Find all the zip code in which the max dews point ain't reached 70.
query_toks: SELECT DISTINCT zip_code FROM weather EXCEPT SELECT DISTINCT zip_code FROM weather WHERE max_dew_point_f > = 70
query_toks_no_value: select distinct zip_code from weather except select distinct zip_code from weather where max_dew_point_f > = value
question_toks: Find all the zip code in which the max dews point ain't reached 70.