Table: filmography_1960s
Columns: title
series
director
production_number
release_date

Question: What is the production number of From Hare to Heir?
SQL: SELECT SUM("production_number") FROM filmography_1960s WHERE "title" = 'from hare to heir'

Question: What is the Series number of the episode with a production number of 1547?
SQL: SELECT "series" FROM filmography_1960s WHERE "production_number" = 1547

Question: What is the production number for the episode directed by Robert McKimson named Mice Follies?
SQL: SELECT COUNT("production_number") FROM filmography_1960s WHERE "director" = 'robert mckimson' AND "title" = 'mice follies'