When the number is 2 what is the lowest amount of al-wedhat wins?
CREATE TABLE "derbi_amman" (
  "num" real,
  "tournament" text,
  "al_faisaly_wins" real,
  "al_wehdat_wins" real,
  "draws" real,
  "total" real,
  "al_faisaly_goals" real,
  "al_wehdat_goals" real
);
SELECT MIN("al_wehdat_wins") FROM "derbi_amman" WHERE "num"=2;