CREATE TABLE "round_17" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What's the average crowd size when the Home team is melbourne?
SQL: SELECT AVG("crowd") FROM "round_17" WHERE "home_team"='melbourne';

Question: Which Venue is the one for the footscray Home team?
SQL: SELECT "venue" FROM "round_17" WHERE "home_team"='footscray';