user: Question: What is the Nationality of the G Player with 4 years NBA Experience?
Columns: ['Player', 'Pos.', 'Nationality', 'Previous team', 'Years of NBA experience [a ]']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['John Barnhill Category:Articles with hCards', 'G', 'United States', 'Detroit Pistons', '4']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "Years of NBA experience [a ]" = '4' AND "Pos." = 'G';