user: Question: what is the average bronze when gold is more than 0, the nation is greece and silver is less than 0?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Turkey', 3.0, 3.0, 3.0, 9.0]
SQL:

assistant: SELECT AVG("Bronze") FROM "Table" WHERE "Gold" > 0.0 AND "Nation" = 'greece' AND "Silver" < 0.0;