user: Question: What was the tie number when the away team was Wrexham?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Bristol City', '0–1', 'Everton', '29 January 1995']
SQL:

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