user: Question: Name the sum of roll for Morrinsville School
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['David Street School', '1–6', 'Coed', 'Morrinsville', 'State', 5.0, 465.0]
SQL:

assistant: SELECT SUM("Roll") FROM "Table" WHERE "Name" = 'Morrinsville School';