What is the maximum dew point in Fahrenheit degree on 7/15/2014 in the area with a zip code of 94301?
the maximum dew point in Fahrenheit degree refers to max_dew_point_f; date = '7/15/2014';
SELECT DISTINCT CASE WHEN date = '7/15/2014' AND zip_code = 94301 THEN max_dew_point_f END FROM weather