user: Question: What was the tie no when Watford was the away team?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Chesterfield', '1–2', 'Notts County', '29 November 1930']
SQL:

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