Which Greater Doubles have Doubles, II Class smaller than 17?
CREATE TABLE "feast_days" (
  "date" real,
  "doubles_i_class" real,
  "doubles_ii_class" real,
  "greater_doubles" real,
  "doubles" real,
  "semidoubles" real,
  "total" real
);
SELECT AVG("greater_doubles") FROM "feast_days" WHERE "doubles_ii_class"<17;