Question: What is the largest number of episodes for a 1989 season dvd release? 
SQL: SELECT MAX("No. of Episodes") FROM "1-17697980-1" WHERE "Year" = '1989';

Question: How many  dvd  titled "Series 5" were released having a release date or a non available date in region 2?
SQL: SELECT COUNT("Region 2") FROM "1-17697980-1" WHERE "DVD Title" = 'Series 5';