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_20967430_3 (ep INTEGER, prod_code VARCHAR)

### Question ###
When 5a06 is the production code what is the highest episode?

### Accurate SQL ###

SELECT MAX(ep) FROM table_20967430_3 WHERE prod_code = "5A06"