CREATE TABLE "round_7" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What day did Collingwood play as the home team?
SQL: SELECT "date" FROM "round_7" WHERE "home_team"='collingwood';

Question: Who was the away team at Princes Park?
SQL: SELECT "away_team" FROM "round_7" WHERE "venue"='princes park';

Question: Who was Hawthorn's away opponent?
SQL: SELECT "away_team" FROM "round_7" WHERE "home_team"='hawthorn';