Which Overall is the highest one that has a College of oklahoma, and a Pick # smaller than 4?
CREATE TABLE "atlanta_falcons_draft_history" (
  "round" real,
  "pick_num" real,
  "overall" real,
  "name" text,
  "position" text,
  "college" text
);
SELECT MAX("overall") FROM "atlanta_falcons_draft_history" WHERE "college"='oklahoma' AND "pick_num"<4;