user: Question: What was the sum roll of Karaka area?
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Conifer Grove School', '1–8', 'Coed', 'Takanini', 'State', 7.0, 526.0]
SQL:

assistant: SELECT SUM("Roll") FROM "Table" WHERE "Area" = 'Karaka';