What's the roll for summerland primary when decile is over 6?
CREATE TABLE "henderson_massey_local_board" (
  "name" text,
  "years" text,
  "gender" text,
  "area" text,
  "authority" text,
  "decile" real,
  "roll" real
);
SELECT "roll" FROM "henderson_massey_local_board" WHERE "decile">6 AND "name"='summerland primary';