CREATE TABLE "table1_1467951_4" (
  "dvd_name" text,
  "ep_no" real,
  "dvd_no" real,
  "release_date" real,
  "additional_information" text
);

Question: What is the largest number of DVDs?
SQL: SELECT MAX("dvd_no") FROM "table1_1467951_4";

Question: What is the highest number of episodes?
SQL: SELECT MAX("ep_no") FROM "table1_1467951_4";

Question: What is the most recent release date?
SQL: SELECT MAX("release_date") FROM "table1_1467951_4";

Question: How many release dates does volume 4 DVD have?
SQL: SELECT COUNT("release_date") FROM "table1_1467951_4" WHERE "dvd_name"='Volume 4';