CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);

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 "complete_formula_one_world_championship_" WHERE "points"<6 AND "engine"='maserati straight-6';

Question: What entrant had a Maserati 250F chassis and fewer than 6 points before 1957?
SQL: SELECT "entrant" FROM "complete_formula_one_world_championship_" WHERE "chassis"='maserati 250f' AND "year"<1957 AND "points"<6;

Question: What chassis has a year of 1951?
SQL: SELECT "chassis" FROM "complete_formula_one_world_championship_" WHERE "year"=1951;

Question: What is the chassis of Officine Alfieri Maserati with a Maserati Straight-6 engine and fewer than 6 points?
SQL: SELECT "chassis" FROM "complete_formula_one_world_championship_" WHERE "engine"='maserati straight-6' AND "entrant"='officine alfieri maserati' AND "points"<6;