What college is pick number 268 from?
CREATE TABLE "1978_pittsburgh_steelers_draft_selection" (
  "round" real,
  "pick_num" text,
  "player" text,
  "position" text,
  "college" text,
  "tenure_w_steelers" text
);
SELECT "college" FROM "1978_pittsburgh_steelers_draft_selection" WHERE "pick_num"='268';