What is the surface when the us open is the championship in the year 1979?
CREATE TABLE table_22860698_2 (surface VARCHAR, championship VARCHAR, year VARCHAR)
SELECT surface FROM table_22860698_2 WHERE championship = "US Open" AND year = 1979
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_22860698_2 (surface VARCHAR, championship VARCHAR, year VARCHAR) Question: What is the surface when the us open is the championship in the year 1979? [/INST] SELECT surface FROM table_22860698_2 WHERE championship = "US Open" AND year = 1979 </s>