When was the circuit portland international raceway?
CREATE TABLE table_name_28 (date VARCHAR, circuit VARCHAR)
SELECT date FROM table_name_28 WHERE circuit = "portland international raceway"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_28 (date VARCHAR, circuit VARCHAR) Question: When was the circuit portland international raceway? [/INST] SELECT date FROM table_name_28 WHERE circuit = "portland international raceway" </s>