What are the ids of all trips that had a duration as long as the average trip duration in the zip code 94103?
SELECT id FROM trip WHERE duration  >=  (SELECT avg(duration) FROM trip WHERE zip_code  =  94103)
ids of all trips = SELECT id FROM trip; had a duration as long as the average trip duration = WHERE duration >= (SELECT avg(duration)); in the zip code 94103 = WHERE zip_code = 94103;