What is Surface, when Opponent is "Jiří Vaněk"?
CREATE TABLE table_name_31 (surface VARCHAR, opponent VARCHAR)
SELECT surface FROM table_name_31 WHERE opponent = "jiří vaněk"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_31 (surface VARCHAR, opponent VARCHAR) Question: What is Surface, when Opponent is "Jiří Vaněk"? [/INST] SELECT surface FROM table_name_31 WHERE opponent = "jiří vaněk" </s>