user: Question: WHAT'S THE TIE NUMBER WITH AN AWAY TEAM OF Wrexham?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Chesterfield', '1–0', 'Nottingham Forest', '15 February 1997']
SQL:

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