Table: bluray_series
Columns: release
of_discs
region_1
region_2
region_4

Question: How many DVDs where were in the complete collection series 1-8 with extras?
SQL: SELECT "of_discs" FROM bluray_series WHERE "release" = 'The Complete Collection Series 1-8 with extras'

Question: Which release had 6 DVDs?
SQL: SELECT "release" FROM bluray_series WHERE "of_discs" = 6

Question: How many region 1's did back to earth have?
SQL: SELECT COUNT("region_1") FROM bluray_series WHERE "release" = 'Back to Earth'