CREATE TABLE "round_20" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: Who was the home team at the game held at Princes Park?
SQL: SELECT "home_team" FROM "round_20" WHERE "venue"='princes park';

Question: Who was the home team when the away team scored 18.18 (126)?
SQL: SELECT "home_team" FROM "round_20" WHERE "away_team_score"='18.18 (126)';

Question: Who was the home team when Hawthorn was the away team?
SQL: SELECT "home_team" FROM "round_20" WHERE "away_team"='hawthorn';