What is the lowest attendance at Venue H in Round R2?
CREATE TABLE "uefa_cup_winner_s_cup" (
  "date" text,
  "round" text,
  "opponent" text,
  "venue" text,
  "result" text,
  "attendance" real
);
SELECT MIN("attendance") FROM "uefa_cup_winner_s_cup" WHERE "venue"='h' AND "round"='r2';