What is the number of career caps for a full back, when tour Apps is smaller than 29?
CREATE TABLE "squad" (
  "name" text,
  "tests" real,
  "club" text,
  "career_caps" real,
  "tour_apps" real,
  "position" text
);
SELECT COUNT("career_caps") FROM "squad" WHERE "position"='full back' AND "tour_apps"<29;