Which trip started from the station with the largest dock count? Give me the trip id.
create table trip (id varchar, start_station_id varchar, PRIMARY KEY (id)); create table station (id varchar, dock_count varchar, PRIMARY KEY (id))
select t1.id from trip as t1 join station as t2 on t1.start_station_id = t2.id order by t2.dock_count desc limit 1