Question: Which driver won when O.M. was the winning constructor ?
SQL: SELECT "Winning driver" FROM "2-12615783-2" WHERE "Winning constructor" = 'O.M.';

Question: Which driver won when the winning constructor was Bugatti at the Boulogne Grand Prix ?
SQL: SELECT "Winning driver" FROM "2-12615783-2" WHERE "Winning constructor" = 'Bugatti' AND "Name" = 'Boulogne Grand Prix';

Question: What race did Meo Constantini win at the circuit of Monza ?
SQL: SELECT "Name" FROM "2-12615783-2" WHERE "Winning driver" = 'Meo Constantini' AND "Circuit" = 'Monza';

Question: On what date did Aymo Maggi win the Rome Grand Prix ?
SQL: SELECT "Date" FROM "2-12615783-2" WHERE "Winning driver" = 'Aymo Maggi' AND "Name" = 'Rome Grand Prix';