user: Question: What is the smallest crowd at Princes Park?
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', '11.19 (85)', 'St Kilda', '9.12 (66)', 'Punt Road Oval', 22000.0, '19 June 1926']
SQL:

assistant: SELECT MIN("Crowd") FROM "Table" WHERE "Venue" = 'Princes Park';