user: Question: what is the points against when the losing bonus is 0 and the club is Banwen RFC?
Columns: ['Club', 'Played', 'Drawn', 'Lost', 'Points for', 'Points against', 'Tries for', 'Tries against', 'Try bonus', 'Losing bonus', 'Points']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Club', 'Played', 'Drawn', 'Lost', 'Points for', 'Points against', 'Tries for', 'Tries against', 'Try bonus', 'Losing bonus', 'Points']
SQL:

assistant: SELECT "Points against" FROM "Table" WHERE "Losing bonus" = '0' AND "Club" = 'Banwen RFC';