CREATE TABLE "uefa_champions_league" (
  "date" text,
  "round" text,
  "opponent" text,
  "venue" text,
  "result" text,
  "attendance" real
);

Question: What was the lowest attendance in round r1 at H venue?
SQL: SELECT MIN("attendance") FROM "uefa_champions_league" WHERE "round"='r1' AND "venue"='h';