user: Question: What is the total roll with a decile less than 7, and an authority of state, in the macraes flat area?
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Ardgowan School', '1–8', 'Coed', 'Oamaru', 'State', 7.0, 121.0]
SQL:

assistant: SELECT SUM("Roll") FROM "Table" WHERE "Decile" = 7.0 AND "Authority" = 'state' AND "Area" = 'macraes flat';