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 is the away team that played home team Hawthorn?
SQL: SELECT "away_team" FROM "round_20" WHERE "home_team"='hawthorn';

Question: What is the name of the home team that played away team Footscray?
SQL: SELECT "home_team" FROM "round_20" WHERE "away_team"='footscray';

Question: Who is the home team that played at venue MCG?
SQL: SELECT "home_team" FROM "round_20" WHERE "venue"='mcg';