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: Which Home team has an Away team of collingwood?
SQL: SELECT "home_team" FROM "round_7" WHERE "away_team"='collingwood';