Name the lelast decile for roll of 428
CREATE TABLE "waitemata_local_board" (
  "name" text,
  "years" text,
  "gender" text,
  "area" text,
  "authority" text,
  "decile" real,
  "roll" real
);
SELECT MIN("decile") FROM "waitemata_local_board" WHERE "roll"=428;