How many Picks have a College of tennessee, and an Overall smaller than 270?
CREATE TABLE "atlanta_falcons_draft_history" (
  "round" real,
  "pick_num" real,
  "overall" real,
  "name" text,
  "position" text,
  "college" text
);
SELECT SUM("pick_num") FROM "atlanta_falcons_draft_history" WHERE "college"='tennessee' AND "overall"<270;