SELECT date ,  zip_code FROM weather WHERE min_dew_point_f  <  (SELECT min(min_dew_point_f) FROM weather WHERE zip_code  =  94107)
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 = value )
Which days had a minimum dew point smaller than any day in zip code 94107 , and in which zip codes were those measurements taken ?