user: Question: What is the total of silver when gold is less than 0?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Soviet Union', 8.0, 6.0, 3.0, 17.0]
SQL:

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