Who was the writer for the episode with 2.15 million u.s.viewers?
CREATE TABLE table_22380270_1 (written_by VARCHAR, us_viewers__millions_ VARCHAR)
SELECT written_by FROM table_22380270_1 WHERE us_viewers__millions_ = "2.15"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_22380270_1 (written_by VARCHAR, us_viewers__millions_ VARCHAR) Question: Who was the writer for the episode with 2.15 million u.s.viewers? [/INST] SELECT written_by FROM table_22380270_1 WHERE us_viewers__millions_ = "2.15" </s>