What year was the US Open that had a partnering of Maikel Scheffers?
CREATE TABLE table_name_56 (year INTEGER, partnering VARCHAR, championship VARCHAR)
SELECT SUM(year) FROM table_name_56 WHERE partnering = "maikel scheffers" AND championship = "us open"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_56 (year INTEGER, partnering VARCHAR, championship VARCHAR) Question: What year was the US Open that had a partnering of Maikel Scheffers? [/INST] SELECT SUM(year) FROM table_name_56 WHERE partnering = "maikel scheffers" AND championship = "us open" </s>