user: Question: what is the date the successor seated because the person Died August 17, 1954?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Georgia 2nd', 'Vacant', 'Rep. Edward E. Cox died during previous congress', 'J. L. Pilcher (D)', 'February 4, 1953']
SQL:

assistant: SELECT "Date successor seated" FROM "Table" WHERE "Reason for change" = 'Died August 17, 1954';