CREATE TABLE "fourth_round_proper" (
  "tie_no" text,
  "home_team" text,
  "score" text,
  "away_team" text,
  "attendance" text
);

Question: What was the tie number of the game when the queens park rangers were the home team?
SQL: SELECT "tie_no" FROM "fourth_round_proper" WHERE "home_team"='queens park rangers';

Question: What was the tie number when the away team was Wrexham?
SQL: SELECT "tie_no" FROM "fourth_round_proper" WHERE "away_team"='wrexham';