Which days had a minimum dew point smaller than any day in zip code 94107, and in which zip codes were those measurements taken?
SELECT date ,  zip_code FROM weather WHERE min_dew_point_f  <  (SELECT min(min_dew_point_f) FROM weather WHERE zip_code  =  94107)
SELECT date ,  zip_code FROM weather WHERE min_dew_point_f  <  (SELECT min(min_dew_point_f) FROM weather WHERE zip_code  =  94107)
[{'date': '12/20/2013', 'zip_code': 94301}, {'date': '12/20/2013', 'zip_code': 95113}, {'date': '12/31/2014', 'zip_code': 95113}]