What's the production code of the episode seen by 11.64 million US viewers?
CREATE TABLE table_12159115_2 (production_code VARCHAR, us_viewers__millions_ VARCHAR)
SELECT production_code FROM table_12159115_2 WHERE us_viewers__millions_ = "11.64"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_12159115_2 (production_code VARCHAR, us_viewers__millions_ VARCHAR) Question: What's the production code of the episode seen by 11.64 million US viewers? [/INST] SELECT production_code FROM table_12159115_2 WHERE us_viewers__millions_ = "11.64" </s>