Table: poirot_characters
Columns: actor
character
title_rank
series
years

Question: What series had the title rank of various?
SQL: SELECT "series" FROM poirot_characters WHERE "title_rank" = 'various'

Question: What is the title rank of the actor who played the character of arthur hastings during series 1-8, 13?
SQL: SELECT "title_rank" FROM poirot_characters WHERE "series" = '1-8, 13' AND "character" = 'arthur hastings'

Question: What is the title rank of the actor who played the character of arthur hastings during series 1-8, 13?
SQL: SELECT "title_rank" FROM poirot_characters WHERE "series" = '1-8, 13' AND "character" = 'arthur hastings'

Question: What is the title rank of actor pauline moran?
SQL: SELECT "title_rank" FROM poirot_characters WHERE "actor" = 'pauline moran'

Question: Which character had a title rank of various?
SQL: SELECT "character" FROM poirot_characters WHERE "title_rank" = 'various'