user: Question: What is the highest rank of austria, which had less than 0 silvers?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Soviet Union', 1.0, 1.0, 0.0, 2.0]
SQL:

assistant: SELECT "Rank" FROM "Table" WHERE "Nation" = 'austria' AND "Silver" < 0.0;