Database: vehicle_driver
Question: Return the ids and models of vehicles that have been driven by exactly two drivers or built by Ziyang.
SQL:
SELECT T1.vehicle_id ,  T1.model FROM vehicle AS T1 JOIN vehicle_driver AS T2 ON T1.vehicle_id  =  T2.vehicle_id GROUP BY T2.vehicle_id HAVING count(*)  =  2 OR T1.builder  =  'Ziyang'