Question: On how many dates was The Complete 4th Series released?
SQL: SELECT COUNT("Date Released") FROM "1-17798548-4" WHERE "Season" = 'The Complete 4th Series';

Question: How many discs for The Complete 4th Series?
SQL: SELECT MAX("# Of Discs") FROM "1-17798548-4" WHERE "Season" = 'The Complete 4th Series';

Question: What day was The Complete 2nd Series: Volume One released?
SQL: SELECT "Date Released" FROM "1-17798548-4" WHERE "Season" = 'The Complete 2nd Series: Volume One';