user: Question: What was the smallest crowd in games at the Corio 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: ['Hawthorn', '14.12 (96)', 'North Melbourne', '3.6 (24)', 'Glenferrie Oval', 4000.0, '11 July 1931']
SQL:

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