What is the lowest year for an engine of ford zetec-r v8, and points greater than 0?
CREATE TABLE "complete_formula_one_results" (
  "year" real,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "points" real
);
SELECT MIN("year") FROM "complete_formula_one_results" WHERE "engine"='ford zetec-r v8' AND "points">0;