CREATE TABLE "round_6" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: Name the date which has a home team of north melbourne
SQL: SELECT "date" FROM "round_6" WHERE "home_team"='north melbourne';

Question: Name the away team for home team of fitzroy
SQL: SELECT "away_team" FROM "round_6" WHERE "home_team"='fitzroy';