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

Question: What is the team 2 with cobreloa as team 1?
SQL: SELECT "team_2" FROM "round_of_16" WHERE "team_1"='cobreloa';

Question: What is the team 1 with a 3-0 2nd leg?
SQL: SELECT "team_1" FROM "round_of_16" WHERE "2nd_leg"='3-0';

Question: What is the team 1 with a 2-1 2nd leg?
SQL: SELECT "team_1" FROM "round_of_16" WHERE "2nd_leg"='2-1';