What was the 2nd leg score having an aggregate score of 4-2?
CREATE TABLE "winners_knockout" (
  "home_1st_leg" text,
  "home_2nd_leg" text,
  "1st_leg" text,
  "2nd_leg" text,
  "aggregate" text
);
SELECT "2nd_leg" FROM "winners_knockout" WHERE "aggregate"='4-2';