Question: How many DVDs where were in The Complete Collection Series 1-8 with extras?
SQL: SELECT "# of discs" FROM "1-25721-4" WHERE "Release" = 'The Complete Collection Series 1-8 with extras';

Question: Which release had 6 DVDs?
SQL: SELECT "Release" FROM "1-25721-4" WHERE "# of discs" = 6.0;

Question: How many region 1's did Back to Earth have?
SQL: SELECT COUNT("Region 1") FROM "1-25721-4" WHERE "Release" = 'Back to Earth';