user: Question: what is the least silver when gold is 0?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'China (CHN)', 6.0, 6.0, 1.0, 13.0]
SQL:

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