CREATE TABLE "round_15" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What was the score of the away team at the MCG?
SQL: SELECT "away_team_score" FROM "round_15" WHERE "venue"='mcg';