How many yardage figures for the player with 72.3 QB rating?
CREATE TABLE "team_career_passing_records" (
  "name" text,
  "completions" real,
  "attempts" real,
  "completion_pct" text,
  "yards" real,
  "touchdowns" real,
  "interceptions" real,
  "qb_rating" text
);
SELECT COUNT("yards") FROM "team_career_passing_records" WHERE "qb_rating"='72.3';