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_225099_3 (date_of_successors_formal_installation VARCHAR, successor VARCHAR)

### Question ###
How many entries are shown for date of successors formal installation where successor is john w. walker (dr)?

### Accurate SQL ###

SELECT COUNT(date_of_successors_formal_installation) FROM table_225099_3 WHERE successor = "John W. Walker (DR)"