Table: ny_undercover_episodes
Columns: series
title
directed_by
written_by
musical_guest_and_song
original_air_date
production_code

Question: Who were the writers for series number 20?
SQL: SELECT "written_by" FROM ny_undercover_episodes WHERE "series" = 20

Question: What is the production code for the show that aired on October 27, 1994?
SQL: SELECT MAX("production_code") FROM ny_undercover_episodes WHERE "original_air_date" = 'October 27, 1994'

Question: Who was the director of the Series 1 episode?
SQL: SELECT "directed_by" FROM ny_undercover_episodes WHERE "series" = 1