What is the weeks rank for the episode with the production code 1alf05? 
CREATE TABLE table_26198709_1 (rank__week_ INTEGER, production_code VARCHAR)
SELECT MAX(rank__week_) FROM table_26198709_1 WHERE production_code = "1ALF05"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: 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?  [/INST] SELECT MAX(rank__week_) FROM table_26198709_1 WHERE production_code = "1ALF05" </s>