What's the sum of years when the Artist of the queen were less than 1?
CREATE TABLE "christmas_number_ones" (
  "year" real,
  "artist" text,
  "album" text,
  "record_label" text,
  "weeks_at_number_one" real
);
SELECT COUNT("year") FROM "christmas_number_ones" WHERE "artist"='queen' AND "weeks_at_number_one"<1;