CREATE TABLE "round_4" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What was the attendance at Moorabbin Oval?
SQL: SELECT AVG("crowd") FROM "round_4" WHERE "venue"='moorabbin oval';

Question: Who was Melbourne's away team opponent?
SQL: SELECT "away_team" FROM "round_4" WHERE "home_team"='melbourne';

Question: What was the attendance at the Footscray away game?
SQL: SELECT "crowd" FROM "round_4" WHERE "away_team"='footscray';