user: Question: What nationality is Diogo?
Columns: ['Nat.', 'Name', 'Moving from', 'Type', 'Transfer window', 'Ends', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['ESP', 'S. Ramos', 'Sevilla', 'Transfer', 'Summer', 2009.0, '€27M']
SQL:

assistant: SELECT "Nat." FROM "Table" WHERE "Name" = 'Diogo';