user: Question: How much silver does the rank have that has gold smaller than 4, and a total of 1 and a rank larger than 6?
Columns: ['Rank', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 8.0, 2.0, 0.0, 10.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Gold" < 4.0 AND "Total" = 1.0 AND "Rank" > 6.0;