What is the highest Doubles, II Class, when Doubles, I Class is less than 19?
CREATE TABLE "some_differences_in_relation_to_later_ed" (
  "date" real,
  "doubles_i_class" real,
  "doubles_ii_class" real,
  "greater_doubles" real,
  "doubles" real,
  "semidoubles" real,
  "total" real
);
SELECT MAX("doubles_ii_class") FROM "some_differences_in_relation_to_later_ed" WHERE "doubles_i_class"<19;