What Authority has a decile greater than 5, with a roll of 170?
CREATE TABLE "south_taranaki_district" (
  "name" text,
  "years" text,
  "area" text,
  "authority" text,
  "decile" real,
  "roll" real
);
SELECT "authority" FROM "south_taranaki_district" WHERE "decile">5 AND "roll"=170;