user: Question: What's the tie number when the away team was Mansfield Town?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Walsall', '1–0', 'Leicester City', '28 January 1978']
SQL:

assistant: SELECT "Tie no" FROM "Table" WHERE "Away team" = 'Mansfield Town';