user: Question: What is the most silver medals when the total is less than 4 and the rank is 12?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Russia', 9.0, 2.0, 6.0, 17.0]
SQL:

assistant: SELECT MAX("Silver") FROM "Table" WHERE "Total" < 4.0 AND "Rank" = '12';