What is the oldest year with a main span feet of 1,640 in South Korea?
CREATE TABLE table_name_52 (year_opened INTEGER, main_span_feet VARCHAR, country VARCHAR)
SELECT MIN(year_opened) FROM table_name_52 WHERE main_span_feet = "1,640" AND country = "south korea"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_52 (year_opened INTEGER, main_span_feet VARCHAR, country VARCHAR) Question: What is the oldest year with a main span feet of 1,640 in South Korea? [/INST] SELECT MIN(year_opened) FROM table_name_52 WHERE main_span_feet = "1,640" AND country = "south korea" </s>