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_20726262_3 ( production_code VARCHAR, usviewers__million_ VARCHAR )

### Question ###
What was the production code for the episode with 3.38 million viewers?

### Accurate SQL ###

SELECT production_code FROM table_20726262_3 WHERE usviewers__million_ = "3.38"