Which DVD Title has a Region 1 of n/a and greater than 3 in No. of Discs?
CREATE TABLE "dvd_releases" (
  "dvd_title" text,
  "no_of_discs" real,
  "year" text,
  "no_of_episodes" real,
  "region_1" text,
  "region_2" text,
  "region_4" text
);
SELECT "dvd_title" FROM "dvd_releases" WHERE "region_1"='n/a' AND "no_of_discs">3;