user: Question: How many original air dates were there for the episode with production code 212?
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Prod. code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [27.0, 1.0, '"The Triangle"', 'Jon Rosenbaum', 'Thomas W. Lynch', 'June25,2011', 201.0]
SQL:

assistant: SELECT COUNT("Original air date") FROM "Table" WHERE "Prod. code" = 212.0;