user: Question: How many Silvers that have a Rank of 2?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'China', 6.0, 3.0, 3.0, 12.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Rank" = '2';