Who is the president when c-span 2009 is 21?
CREATE TABLE table_name_57 (president VARCHAR, c_span_2009 VARCHAR)
SELECT president FROM table_name_57 WHERE c_span_2009 = "21"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_57 (president VARCHAR, c_span_2009 VARCHAR) Question: Who is the president when c-span 2009 is 21? [/INST] SELECT president FROM table_name_57 WHERE c_span_2009 = "21" </s>