user: Question: What is the tie number total when harlow town is the away team?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [2.0, 'Sheffield', '2–1', 'Guiseley', 451.0]
SQL:

assistant: SELECT SUM("Tie no") FROM "Table" WHERE "Away team" = 'harlow town';