WHAT TEAM 1 HAS A 1st leg of 1–1, and a 2nd leg of 1–3?
CREATE TABLE "round_of_16" (
  "team_1" text,
  "agg" text,
  "team_2" text,
  "1st_leg" text,
  "2nd_leg" text
);
SELECT "team_1" FROM "round_of_16" WHERE "1st_leg"='1–1' AND "2nd_leg"='1–3';