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_20345624_2 (writer VARCHAR, original_airdate VARCHAR)

### Question ###
Name the number of writers for airdate of 15 july 1967

### Accurate SQL ###

SELECT COUNT(writer) FROM table_20345624_2 WHERE original_airdate = "15 July 1967"