What was the number of season number entries that had US Viewers of 12.30 million?
CREATE TABLE table_21781578_2 (season_no VARCHAR, us_viewers__millions_ VARCHAR)
SELECT COUNT(season_no) FROM table_21781578_2 WHERE us_viewers__millions_ = "12.30"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21781578_2 (season_no VARCHAR, us_viewers__millions_ VARCHAR) Question: What was the number of season number entries that had US Viewers of 12.30 million? [/INST] SELECT COUNT(season_no) FROM table_21781578_2 WHERE us_viewers__millions_ = "12.30" </s>