user: Question: Name the most decile for roll of 428
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Bayfield School', '1–6', 'Coed', 'Herne Bay', 'State', 10.0, 387.0]
SQL:

assistant: SELECT MAX("Decile") FROM "Table" WHERE "Roll" = 428.0;