SELECT DISTINCT zip_code FROM weather EXCEPT SELECT DISTINCT zip_code FROM weather WHERE max_dew_point_f  >=  70
What are all the different zip codes that have a maximum dew point that was always below 70?
SELECT DISTINCT zip_code FROM weather EXCEPT SELECT DISTINCT zip_code FROM weather WHERE max_dew_point_f > = 70
select distinct zip_code from weather except select distinct zip_code from weather where max_dew_point_f > = value
What are all the different zip codes that have a maximum dew point that was always below 70 ?