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_225200_4 (successor VARCHAR, date_successor_seated VARCHAR)

### Question ###
Name the successor for not filled this congress

### Accurate SQL ###

SELECT successor FROM table_225200_4 WHERE date_successor_seated = "Not filled this congress"