user: Question: How many original air dates are there for the episode with code CA210?
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [12.0, 1.0, '"Begin the Begin"', 'Kate Woods', 'Matt Corman & Chris Ord', 'June7,2011', 'CA201', '4.56']
SQL:

assistant: SELECT COUNT("Original air date") FROM "Table" WHERE "Production code" = 'CA210';