What is the total of attendance at Venue h when Auxerre were playing?
CREATE TABLE "uefa_champions_league" (
  "date" text,
  "round" text,
  "opponent" text,
  "venue" text,
  "result" text,
  "attendance" real
);
SELECT SUM("attendance") FROM "uefa_champions_league" WHERE "venue"='h' AND "opponent"='auxerre';