user: Question: Which tie number had an away team of the Tranmere Rovers?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Aston Villa', '0–1', 'Coventry City', '14 February 1998']
SQL:

assistant: SELECT "Tie no" FROM "Table" WHERE "Away team" = 'Tranmere Rovers';