user: Question: What is the least number of gold medals won among nations ranked 1 with no silver medals?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Germany (GER)', 1.0, 1.0, 0.0, 2.0]
SQL:

assistant: SELECT MIN("Gold") FROM "Table" WHERE "Rank" = 1.0 AND "Silver" < 1.0;