What was the first airdate with a viewership of 4.77 million?
CREATE TABLE table_17641206_4 (original_airdate VARCHAR, viewership VARCHAR)
SELECT original_airdate FROM table_17641206_4 WHERE viewership = "4.77 million"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_17641206_4 (original_airdate VARCHAR, viewership VARCHAR) Question: What was the first airdate with a viewership of 4.77 million? [/INST] SELECT original_airdate FROM table_17641206_4 WHERE viewership = "4.77 million" </s>