Table schema:
CREATE TABLE weather (date VARCHAR, zip_code VARCHAR, min_dew_point_f INTEGER)

Question: On which day and in which zip code was the min dew point lower than any day in zip code 94107?
SQL: SELECT date, zip_code FROM weather WHERE min_dew_point_f < (SELECT MIN(min_dew_point_f) FROM weather WHERE zip_code = 94107)