How many episodes had an original air date with 5.1 million viewers
CREATE TABLE table_15938543_1 (original_air_date VARCHAR, us_viewers__million_ VARCHAR)
SELECT COUNT(original_air_date) FROM table_15938543_1 WHERE us_viewers__million_ = "5.1"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_15938543_1 (original_air_date VARCHAR, us_viewers__million_ VARCHAR) Question: How many episodes had an original air date with 5.1 million viewers [/INST] SELECT COUNT(original_air_date) FROM table_15938543_1 WHERE us_viewers__million_ = "5.1" </s>