CREATE TABLE "round_18" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What venue is the home field of Richmond?
SQL: SELECT "venue" FROM "round_18" WHERE "home_team"='richmond';

Question: What was the score of the away team in the match at Princes Park?
SQL: SELECT "away_team_score" FROM "round_18" WHERE "venue"='princes park';

Question: What was the score of the home team in the match at Western Oval?
SQL: SELECT "home_team_score" FROM "round_18" WHERE "venue"='western oval';