CREATE TABLE "round_of_16" (
  "team_1" text,
  "agg" text,
  "team_2" text,
  "1st_leg" text,
  "2nd_leg" text
);

Question: What is team 1 when team 2 is Manchester United?
SQL: SELECT "team_1" FROM "round_of_16" WHERE "team_2"='manchester united';

Question: What is the agg when team 1 is Milan?
SQL: SELECT "agg" FROM "round_of_16" WHERE "team_1"='milan';