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

Question: What is the highest attendance for the match against west ham united at the venue of a?
SQL: SELECT MAX("attendance") FROM "fa_premier_league" WHERE "venue"='a' AND "opponent"='west ham united';