user: Question: When is a Roll of 9?
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Aparima College', '7-15', 'Coed', 'Riverton', 'State', 5.0, 178.0]
SQL:

assistant: SELECT "Years" FROM "Table" WHERE "Roll" = 9.0;