Table: fa_cup_matches_7
Columns: tie_no
home_team
score
away_team
attendance

Question: What was the tie number of the game when the queens park rangers were the home team?
SQL: SELECT "tie_no" FROM fa_cup_matches_7 WHERE "home_team" = 'queens park rangers'

Question: What was the tie number when the away team was Wrexham?
SQL: SELECT "tie_no" FROM fa_cup_matches_7 WHERE "away_team" = 'wrexham'