Table: all_creatures_series_info
Columns: dvd_title
no_of_discs
year
no_of_episodes
region_1
region_2
region_4

Question: Which DVD Title has a Region 1 of n/a and greater than 3 in No. of Discs?
SQL: SELECT "dvd_title" FROM all_creatures_series_info WHERE "region_1" = 'n/a' AND "no_of_discs" > 3

Question: Which region 1 has 12 Episodes and a Region 2 of 18 August 2008?
SQL: SELECT "region_1" FROM all_creatures_series_info WHERE "no_of_episodes" = 12 AND "region_2" = '18 august 2008'