CREATE TABLE table_57644 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the smallest crowd in games at the corio oval?
SELECT MIN("Crowd") FROM table_57644 WHERE "Venue" = 'corio oval'
SELECT MIN("Crowd") FROM "table_57644" WHERE "Venue" = 'corio oval'