How many entrants have a mercedes fo 108w 2.4l v8 engine and over 0 points?
CREATE TABLE "complete_formula_one_results" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT COUNT("year") FROM "complete_formula_one_results" WHERE "engine"='mercedes fo 108w 2.4l v8' AND "points">0;