user: Question: What is the lowest Gold, when Nation is canada, and when Rank is greater than 4?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'South Korea', 5.0, 4.0, 4.0, 13.0]
SQL:

assistant: SELECT MIN("Gold") FROM "Table" WHERE "Nation" = 'canada' AND "Rank" > 4.0;