user: Question: how many winners from Vietnam
Columns: ['#', 'Nation', 'Winners', 'Runners-up', '3rd Place', '4th Place']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'India', 1.0, 0.0, 0.0, 0.0]
SQL:

assistant: SELECT SUM("Winners") FROM "Table" WHERE "Nation" = 'Vietnam';