Question: Who is the constructor of John Surtees's Oulton Park circuit car?
SQL: SELECT "Constructor" FROM "2-1140090-6" WHERE "Circuit" = 'Oulton Park' AND "Winning driver" = 'John Surtees';

Question: Which race was Matra the constructor?
SQL: SELECT "Race Name" FROM "2-1140090-6" WHERE "Constructor" = 'Matra';

Question: Which race was at Hockenheim circuit?
SQL: SELECT "Race Name" FROM "2-1140090-6" WHERE "Circuit" = 'Hockenheim';

Question: Who was the winner of the XII Spring Trophy race with BRM as the constructor?
SQL: SELECT "Winning driver" FROM "2-1140090-6" WHERE "Constructor" = 'BRM' AND "Race Name" = 'XII Spring Trophy';