user: Question: Which match had the largest crowd size where the away team was North Melbourne?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['St Kilda', '7.7 (49)', 'South Melbourne', '13.15 (93)', 'Junction Oval', 21000.0, '30 June 1951']
SQL:

assistant: SELECT MAX("Crowd") FROM "Table" WHERE "Away team" = 'North Melbourne';