Who was the away team playing at Carlton?
CREATE TABLE "1st_round" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "ground" text,
  "crowd" real,
  "date" text
);
SELECT "away_team" FROM "1st_round" WHERE "home_team"='Carlton';