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_23255941_1 ( written_by VARCHAR, directed_by VARCHAR )

### Question ###
How many writers were there in the episode directed by Charles Haid?

### Accurate SQL ###

SELECT COUNT(written_by) FROM table_23255941_1 WHERE directed_by = "Charles Haid"