Question: Name who wrote the episode directed by patrick duffy airing on november 7, 1997
Schema: create table table_2468961_8 (written_by varchar, directed_by varchar, original_air_date varchar, PRIMARY KEY (written_by))
SQL: select written_by from table_2468961_8 where directed_by = "patrick duffy" and original_air_date = "november 7, 1997"