user: Question: How many vacators have October 22, 1808 as date successor seated?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['North Carolina 7th', 'John Culpepper (F)', 'Seat declared vacant January 2, 1808', 'John Culpepper (F)', 'Seated February 23, 1808']
SQL:

assistant: SELECT COUNT("Vacator") FROM "Table" WHERE "Date successor seated" = 'October 22, 1808';