For a school with authority of state and a roll of 798, what is the decile?
CREATE TABLE "whakatane_district" (
  "name" text,
  "years" text,
  "gender" text,
  "area" text,
  "authority" text,
  "decile" real,
  "roll" real
);
SELECT "decile" FROM "whakatane_district" WHERE "authority"='state' AND "roll"=798;