How many U.S. viewers watched the episode directed by Frank Waldeck?
CREATE TABLE table_21634403_2 (us_viewers__millions_ VARCHAR, directed_by VARCHAR)
SELECT us_viewers__millions_ FROM table_21634403_2 WHERE directed_by = "Frank Waldeck"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21634403_2 (us_viewers__millions_ VARCHAR, directed_by VARCHAR) Question: How many U.S. viewers watched the episode directed by Frank Waldeck? [/INST] SELECT us_viewers__millions_ FROM table_21634403_2 WHERE directed_by = "Frank Waldeck" </s>