What is the maximum aperture of the lens(es) with a focal length of 20mm?
CREATE TABLE table_name_77 (max_aperture VARCHAR, focal_length VARCHAR)
SELECT max_aperture FROM table_name_77 WHERE focal_length = "20mm"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_77 (max_aperture VARCHAR, focal_length VARCHAR) Question: What is the maximum aperture of the lens(es) with a focal length of 20mm? [/INST] SELECT max_aperture FROM table_name_77 WHERE focal_length = "20mm" </s>