What is the average grid of driver Christian Vietoris who has less than 12 laps?
CREATE TABLE "sprint_race" (
  "team" text,
  "driver" text,
  "laps" real,
  "time" text,
  "grid" real
);
SELECT AVG("grid") FROM "sprint_race" WHERE "driver"='christian vietoris' AND "laps"<12;