When is the earliest season at waverley park, a Score of 15.12 (102) – 9.14 (68), and a Margin larger than 34?
CREATE TABLE "back_to_back_night_pre_season_winners" (
  "season" real,
  "premier" text,
  "runner_up" text,
  "score" text,
  "venue" text,
  "attendance" real,
  "margin" real
);
SELECT MIN("season") FROM "back_to_back_night_pre_season_winners" WHERE "venue"='waverley park' AND "score"='15.12 (102) – 9.14 (68)' AND "margin">34;