user: Question: What was the smallest crowd at Junction Oval?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Geelong', '22.12 (144)', 'Hawthorn', '19.15 (129)', 'Kardinia Park', 4500.0, '9 August 1941']
SQL:

assistant: SELECT MIN("Crowd") FROM "Table" WHERE "Venue" = 'Junction Oval';