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_98 (date_of_replacement VARCHAR, date_outgoing VARCHAR)

### Question ###
When did the manager take over for the manager that left on August 20, 2008?

### Accurate SQL ###

SELECT date_of_replacement FROM table_name_98 WHERE date_outgoing = "august 20, 2008"