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_18367694_3 (no_in_season VARCHAR, directed_by VARCHAR)

### Question ###
When joan tewkesbury is the director what is the number in seasons?

### Accurate SQL ###

SELECT no_in_season FROM table_18367694_3 WHERE directed_by = "Joan Tewkesbury"