Which lowest position has goals against smaller than 78, Points of 42-2, and Wins larger than 15?
CREATE TABLE "group_b_relegation" (
  "position" real,
  "club" text,
  "played" real,
  "points" text,
  "wins" real,
  "draws" real,
  "losses" real,
  "goals_for" real,
  "goals_against" real,
  "goal_difference" real
);
SELECT MIN("position") FROM "group_b_relegation" WHERE "goals_against"<78 AND "points"='42-2' AND "wins">15;