What was the highest week with a w 21-17 result, and more than 45,254 in attendance?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "attendance" real
);
SELECT MAX("week") FROM "schedule" WHERE "result"='w 21-17' AND "attendance">'45,254';