What was the surface for the May 10, 2009 tournament?
CREATE TABLE table_name_91 (surface VARCHAR, date VARCHAR)
SELECT surface FROM table_name_91 WHERE date = "may 10, 2009"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_91 (surface VARCHAR, date VARCHAR) Question: What was the surface for the May 10, 2009 tournament? [/INST] SELECT surface FROM table_name_91 WHERE date = "may 10, 2009" </s>