user: Question: Which tie number had a home team of Derby County?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Leicester City', '1–2', 'Manchester United', '14 February 1976']
SQL:

assistant: SELECT "Tie no" FROM "Table" WHERE "Home team" = 'Derby County';