user: Question: What is the low silver total for Switzerland with over 0 golds?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze']
Types: ['text', 'text', 'real', 'real', 'real']
Sample row: ['1', 'Greece', 19.0, 5.0, 1.0]
SQL:

assistant: SELECT MIN("Silver") FROM "Table" WHERE "Gold" > 0.0 AND "Nation" = 'Switzerland';