user: ### NOW ANSWER:
Question: Name the least silver when gold is less than 0
Columns: ['Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['United States (USA)', 9.0, 10.0, 4.0, 23.0]
SQL:

assistant: SELECT MIN("Silver") FROM "Table" WHERE "Gold" < 0.0;