Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_68 ( replaced_by VARCHAR, date_of_vacancy VARCHAR )

### Question ###
What is Replaced By, when Date of Vacancy is '23 February 2009'?

### Accurate SQL ###

SELECT replaced_by FROM table_name_68 WHERE date_of_vacancy = "23 february 2009"