Table: tv_series_info_2
Columns: series
episodes
series_premiere
series_finale
region_1
region_2
region_4

Question: Which episode was N/A in region 1
SQL: SELECT "episodes" FROM tv_series_info_2 WHERE "region_1" = 'N/A'

Question: When was series premiere on the pilot episode
SQL: SELECT "series_premiere" FROM tv_series_info_2 WHERE "series" = 'Pilot'

Question: What is the region 1 date for series 4
SQL: SELECT "region_1" FROM tv_series_info_2 WHERE "series" = '4'

Question: How many episodes in the series that premieres 5 february 2012
SQL: SELECT "episodes" FROM tv_series_info_2 WHERE "series_premiere" = '5 February 2012'