user: Question: The episode with production code 693-002, has how many original airdates?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original airdate', 'Production code']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"The Day that Everything Changed"', 'Sam Montes', 'Man of Action', 'April 23, 2010', '693-001']
SQL:

assistant: SELECT COUNT("Original airdate") FROM "Table" WHERE "Production code" = '693-002';