user: Question: what is the number of series where the airdate is December 26, 1964?
Columns: ['Series #', 'Season #', 'Title', 'Director', 'Writer(s)', 'Airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [342.0, 1.0, '" Blue Heaven "', "Michael O'Herlihy Category:Articles with hCards", 'Les Crutchfield Category:Articles with hCards', 'September 26, 1964']
SQL:

assistant: SELECT COUNT("Series #") FROM "Table" WHERE "Airdate" = 'December 26, 1964';