What is the aggregate for the first round for K.S.V. Waregem?
CREATE TABLE "european_history" (
  "round" text,
  "club" text,
  "home" text,
  "away" text,
  "aggregate" text
);
SELECT "aggregate" FROM "european_history" WHERE "round"='first round' AND "club"='k.s.v. waregem';