user: Question: What is the total amount of Gold from guatemala and silver smaller than 0?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Mexico', 9.0, 11.0, 9.0, 29.0]
SQL:

assistant: SELECT SUM("Gold") FROM "Table" WHERE "Nation" = 'guatemala' AND "Silver" < 0.0;