user: Question: How many production codes were there for the episode that aired on November 15?
Columns: ['Episode #', 'The Wørd', 'Guest', 'Introductory phrase', 'Original airdate', 'Production code']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [791.0, '"None"', 'David Frum , Katrina vanden Heuvel', '"Shaka brah! This is The Colbert Report!"', 'November 02', 6139.0]
SQL:

assistant: SELECT COUNT("Production code") FROM "Table" WHERE "Original airdate" = 'November 15';