Table: episode_data_17
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
production_code

Question: How many different production codes does the episode directed by Dominic Polcino have?
SQL: SELECT COUNT("production_code") FROM episode_data_17 WHERE "directed_by" = 'Dominic Polcino'

Question: What's the production code of the episode written by Kirker Butler and directed by Dan Povenmire?
SQL: SELECT "production_code" FROM episode_data_17 WHERE "written_by" = 'Kirker Butler' AND "directed_by" = 'Dan Povenmire'