What is 2nd Leg, when Team 2 is "Dunaferr"?
CREATE TABLE "qualifying_round" (
  "team_1" text,
  "agg" text,
  "team_2" text,
  "1st_leg" text,
  "2nd_leg" text
);
SELECT "2nd_leg" FROM "qualifying_round" WHERE "team_2"='dunaferr';