user: Question: What is the average Silver with rank 30 and a Bronze greater than 0
Columns: ['Rank', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['1', 84.0, 69.0, 69.0, 222.0]
SQL:

assistant: SELECT AVG("Silver") FROM "Table" WHERE "Rank" = '30' AND "Bronze" > 0.0;