user: Question: What is the lowest crowd when North Melbourne played at home?
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', '13.14 (92)', 'South Melbourne', '22.12 (144)', 'Glenferrie Oval', 12000.0, '2 June 1934']
SQL:

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