What was the date when Chris Amon won?
CREATE TABLE table_1140090_6 (date VARCHAR, winning_driver VARCHAR)
SELECT date FROM table_1140090_6 WHERE winning_driver = "Chris Amon"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_1140090_6 (date VARCHAR, winning_driver VARCHAR) Question: What was the date when Chris Amon won? [/INST] SELECT date FROM table_1140090_6 WHERE winning_driver = "Chris Amon" </s>