user: Question: How many silver metals are possessed by countries with 2 gold medals?
Columns: ['Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Canada (CAN)', 1.0, 1.0, 0.0, 2.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Gold" = 2.0;