user: Question: What is the highest crowd with North Melbourne as away team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '17.13 (115)', 'North Melbourne', '11.11 (77)', 'Glenferrie Oval', 11000.0, '29 April 1939']
SQL:

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