For a Team 1 of Al-Merrikh, what was the aggregate?
CREATE TABLE "round_16" (
  "team_1" text,
  "agg" text,
  "team_2" text,
  "1st_leg" text,
  "2nd_leg" text
);
SELECT "agg" FROM "round_16" WHERE "team_1"='al-merrikh';