How many races did Hamilton participate in after 2010?
SELECT count ( * )  FROM drivers AS T1 JOIN results AS T2 ON T1.driverid  =  T2.driverid JOIN races AS T3 ON T2.raceid  =  T3.raceid WHERE T3.year > 2010 and T1.surname = 'Hamilton' GROUP BY T1.driverid
races participated in after 2010 refers to year > 2010; Hamilton refers to driver with surname 'Hamilton'; counting races refers to COUNT(*); joining tables drivers, results, and races to match driver records with races participated in.