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_26198709_1 (rank__week_ INTEGER, production_code VARCHAR)

### Question ###
What is the weeks rank for the episode with the production code 1alf05? 

### Accurate SQL ###

SELECT MAX(rank__week_) FROM table_26198709_1 WHERE production_code = "1ALF05"