user: Question: With Sheffield United as the away team and the date, what home team has a tie no of 15?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Blackpool', '3–2', 'Middlesbrough', '26 January 1946']
SQL:

assistant: SELECT "Home team" FROM "Table" WHERE "Tie no" = '15' AND "Away team" = 'Sheffield United' AND "Date" = 'Sheffield United';