What is the average Bike No, when Driver / Passenger is Joris Hendrickx / Kaspars Liepins, and when Position is greater than 4?
CREATE TABLE "riders" (
  "position" real,
  "driver_passenger" text,
  "equipment" text,
  "bike_no" real,
  "points" real
);
SELECT AVG("bike_no") FROM "riders" WHERE "driver_passenger"='joris hendrickx / kaspars liepins' AND "position">4;