Which Authority has a Gender of coed, a Decile smaller than 6, and an Area of merivale?
CREATE TABLE "tauranga_city" (
  "name" text,
  "gender" text,
  "area" text,
  "authority" text,
  "decile" real
);
SELECT "authority" FROM "tauranga_city" WHERE "gender"='coed' AND "decile"<6 AND "area"='merivale';