Table: fa_cup_matches_41
Columns: tie_no
home_team
score
away_team
date

Question: What is the date when tie number is 6?
SQL: SELECT "date" FROM fa_cup_matches_41 WHERE "tie_no" = '6'

Question: Who is the home team with tie number 9?
SQL: SELECT "home_team" FROM fa_cup_matches_41 WHERE "tie_no" = '9'

Question: Who is the home team when Sheffield United is the away team?
SQL: SELECT "home_team" FROM fa_cup_matches_41 WHERE "away_team" = 'sheffield united'

Question: What is the date when Aston Villa is the away team?
SQL: SELECT "date" FROM fa_cup_matches_41 WHERE "away_team" = 'aston villa'

Question: Who is the home team on 31 January 1951 when away team was Sheffield United?
SQL: SELECT "home_team" FROM fa_cup_matches_41 WHERE "date" = '31 january 1951' AND "away_team" = 'sheffield united'