What is the average year with Nathan Robertson Gail Emms in mixed doubles?
CREATE TABLE table_name_71 (year INTEGER, mixed_doubles VARCHAR)
SELECT AVG(year) FROM table_name_71 WHERE mixed_doubles = "nathan robertson gail emms"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_71 (year INTEGER, mixed_doubles VARCHAR) Question: What is the average year with Nathan Robertson Gail Emms in mixed doubles? [/INST] SELECT AVG(year) FROM table_name_71 WHERE mixed_doubles = "nathan robertson gail emms" </s>