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

Question: What round has 2-1 as the result, and A as the venue?
SQL: SELECT "round" FROM "league_cup" WHERE "result"='2-1' AND "venue"='a';