What is the Gender of students at a school with a Decile of 5 and a Roll of 90?
CREATE TABLE "kaikoura_district" (
  "name" text,
  "years" text,
  "gender" text,
  "area" text,
  "authority" text,
  "decile" real,
  "roll" real
);
SELECT "gender" FROM "kaikoura_district" WHERE "decile"=5 AND "roll"=90;