user: Question: How many celebrities had an 18October2007 Original air Date?
Columns: ['Total No.', 'Celebrity', 'Director', 'Original air date', 'Viewers']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Shaun Majumder', 'Scott Harper', '11October2007', 'N/A']
SQL:

assistant: SELECT COUNT("Celebrity") FROM "Table" WHERE "Original air date" = '18October2007';