user: Question: What is Replaced By, when Date of Vacancy is "23 February 2009"?
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Replaced by', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Konyaspor', 'Raşit Çetiner', 'Sacked', '17 September 2008', 'Giray Bulak', '24 September 2008']
SQL:

assistant: SELECT "Replaced by" FROM "Table" WHERE "Date of vacancy" = '23 February 2009';