user: Question: What is the highest Attendance when the away team was Wrexham?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['1', 'Blackpool', '1 – 0', 'Port Vale', 4669.0]
SQL:

assistant: SELECT MAX("Attendance") FROM "Table" WHERE "Away team" = 'Wrexham';