Table: good_news_ratings_3
Columns: episode_no
airdate
viewers
bbc_three_weekly_ranking
cable_rank

Question: When 3 is the bbc three weekly ranking what is the airdate?
SQL: SELECT "airdate" FROM good_news_ratings_3 WHERE "bbc_three_weekly_ranking" = '3'

Question: When 656000 is the amount of viewers and n/a is the cable rank what is the airdate?
SQL: SELECT "airdate" FROM good_news_ratings_3 WHERE "cable_rank" = 'N/A' AND "viewers" = 656000