What was the overall pick for the player who was a guard and had a round less than 9?
CREATE TABLE "nfl_draft" (
  "round" real,
  "overall" real,
  "player" text,
  "position" text,
  "school_club_team" text
);
SELECT AVG("overall") FROM "nfl_draft" WHERE "position"='guard' AND "round"<9;