How many viewers, in millions, were for the episode directed by Tawnia McKiernan?
CREATE TABLE table_12159115_3 (us_viewers__millions_ VARCHAR, directed_by VARCHAR)
SELECT us_viewers__millions_ FROM table_12159115_3 WHERE directed_by = "Tawnia McKiernan"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_12159115_3 (us_viewers__millions_ VARCHAR, directed_by VARCHAR) Question: How many viewers, in millions, were for the episode directed by Tawnia McKiernan? [/INST] SELECT us_viewers__millions_ FROM table_12159115_3 WHERE directed_by = "Tawnia McKiernan" </s>