user: Question: Which venue did north melbourne play away with a crowd greater than 30000?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Richmond', '7.25 (67)', 'St Kilda', '5.8 (38)', 'Punt Road Oval', 16000.0, '4 August 1934']
SQL:

assistant: SELECT "Venue" FROM "Table" WHERE "Crowd" > 30000.0 AND "Away team" = 'north melbourne';