Which leader of the Democratic Unionist party has more than 8 seats?
CREATE TABLE "leaders_in_the_northern_ireland_assembel" (
  "leader" text,
  "party" text,
  "leader_s_seat" text,
  "number_of_seats" real,
  "leader_since" text
);
SELECT "leader" FROM "leaders_in_the_northern_ireland_assembel" WHERE "number_of_seats">8 AND "party"='democratic unionist party';