Which were the trips that started at Mountain View City Hall and ended on a rainy day?
started at refers to start_station_name; start_station_name = 'Mountain View City Hall'; ended on a rainy day refers to end_date where events = 'rain';
SELECT T1.id FROM trip AS T1 INNER JOIN weather AS T2 WHERE T2.events = 'Rain' AND T1.start_station_name = 'Mountain View City Hall'