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

Question: What year engine does a ferrari v6 have?
SQL: SELECT "year" FROM "complete_formula_one_world_championship_" WHERE "engine"='ferrari v6';

Question: What is the entrant of a chassis maserati 250f, also has 6 points and older than year 1957?
SQL: SELECT "entrant" FROM "complete_formula_one_world_championship_" WHERE "chassis"='maserati 250f' AND "points"='6' AND "year"<1957;