What discs has a region 1 release date of January 22, 2008?
CREATE TABLE "dvd_releases" (
  "volume" text,
  "discs" real,
  "episodes" real,
  "region_1_release" text,
  "region_2_release" text,
  "region_4_release" text
);
SELECT "discs" FROM "dvd_releases" WHERE "region_1_release"='january 22, 2008';