user: Question: What is the sum of sliver medals when there were 2 gold medals, less than 15 total medals, and the rank is greater than 5?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Brazil', 20.0, 8.0, 14.0, 42.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Gold" = 2.0 AND "Total" < 15.0 AND "Rank" > 5.0;