Question: What is the average year of an entrant that had fewer than 6 points and a Maserati Straight-6 engine?
SQL: SELECT AVG("Year") FROM "2-1235995-1" WHERE "Points" < 6.0 AND "Engine" = 'Maserati Straight-6';

Question: What entrant had a Maserati 250F chassis and fewer than 6 points before 1957?
SQL: SELECT "Entrant" FROM "2-1235995-1" WHERE "Chassis" = 'Maserati 250F' AND "Year" < 1957.0 AND "Points" < 6.0;

Question: What chassis has a year of 1951?
SQL: SELECT "Chassis" FROM "2-1235995-1" WHERE "Year" = 1951.0;

Question: What is the chassis of Officine Alfieri Maserati with a Maserati Straight-6 engine and fewer than 6 points?
SQL: SELECT "Chassis" FROM "2-1235995-1" WHERE "Engine" = 'Maserati Straight-6' AND "Entrant" = 'Officine Alfieri Maserati' AND "Points" < 6.0;