CREATE TABLE station (id VARCHAR, dock_count VARCHAR)
CREATE TABLE trip (id VARCHAR, start_station_id VARCHAR)

Which trip started from the station with the largest dock count? Give me the trip 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
SELECT "T1"."id" FROM "trip" AS "T1" JOIN "station" AS "T2" ON "T1"."start_station_id" = "T2"."id" ORDER BY "T2"."dock_count" DESC NULLS LAST LIMIT 1