user: Question: Which Silver has a Nation of total, and a Bronze smaller than 18?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Soviet Union', 6.0, 7.0, 1.0, 14.0]
SQL:

assistant: SELECT "Silver" FROM "Table" WHERE "Nation" = 'total' AND "Bronze" < 18.0;