What is the full name of the driver who delivered the most shipments to the least populated city?
least populated city refers to Min(population); fullname refers to first_name, last_name; most shipment refers to driver_id where Max(Count (ship_id))
SELECT T1.first_name, T1.last_name FROM driver AS T1 INNER JOIN shipment AS T2 ON T1.driver_id = T2.driver_id INNER JOIN city AS T3 ON T3.city_id = T2.city_id GROUP BY T1.first_name, T1.last_name, T3.population HAVING T3.population = MAX(T3.population) ORDER BY COUNT(*) DESC LIMIT 1