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

Question: What is Agg., when Team 1 is CD Elá Nguema?
SQL: SELECT "agg" FROM "preliminary_round" WHERE "team_1"='cd elá nguema';

Question: What is 1st Leg, when 2nd Leg is 1-3?
SQL: SELECT "1st_leg" FROM "preliminary_round" WHERE "2nd_leg"='1-3';

Question: What is 1st Leg, when 2nd Leg is 0-1?
SQL: SELECT "1st_leg" FROM "preliminary_round" WHERE "2nd_leg"='0-1';

Question: What is Team 2, when 2nd Leg is 1-0?
SQL: SELECT "team_2" FROM "preliminary_round" WHERE "2nd_leg"='1-0';

Question: What is Team 2, when 2nd Leg is 2-1?
SQL: SELECT "team_2" FROM "preliminary_round" WHERE "2nd_leg"='2-1';

Question: What is Team 2, when 2nd Leg is 0-3 1?
SQL: SELECT "team_2" FROM "preliminary_round" WHERE "2nd_leg"='0-3 1';