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

Question: Name the average points for chassis of stevens and year less than 1950
SQL: SELECT AVG("points") FROM "complete_formula_one_world_championship_" WHERE "chassis"='stevens' AND "year"<1950;

Question: Name the least points for chassis of kurtis kraft 500a
SQL: SELECT MIN("points") FROM "complete_formula_one_world_championship_" WHERE "chassis"='kurtis kraft 500a';

Question: Name the total number of year for chassis of kurtis kraft 4000 and points more than 2
SQL: SELECT COUNT("year") FROM "complete_formula_one_world_championship_" WHERE "chassis"='kurtis kraft 4000' AND "points">2;