What is the rank of the airport with a  freight ( metric tonnes ) of 23791?
CREATE TABLE table_13836704_6 (rank VARCHAR, freight___metric_tonnes__ VARCHAR)
SELECT rank FROM table_13836704_6 WHERE freight___metric_tonnes__ = 23791
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_13836704_6 (rank VARCHAR, freight___metric_tonnes__ VARCHAR) Question: What is the rank of the airport with a  freight ( metric tonnes ) of 23791? [/INST] SELECT rank FROM table_13836704_6 WHERE freight___metric_tonnes__ = 23791 </s>