CREATE TABLE "season_by_season" (
  "season" text,
  "tier" real,
  "league" text,
  "pos" real,
  "turkish_cup" text
);

Question: What is the lowest tier for a position smaller than 7 for a Turkish Cup group stage?
SQL: SELECT MIN("tier") FROM "season_by_season" WHERE "turkish_cup"='group stage' AND "pos"<7;