who is the team 2 when the 2nd leg is 3-4?
CREATE TABLE "relegation_playoffs" (
  "team_1" text,
  "agg" text,
  "team_2" text,
  "1st_leg" text,
  "2nd_leg" text
);
SELECT "team_2" FROM "relegation_playoffs" WHERE "2nd_leg"='3-4';