What year(s) was the race status piston?
CREATE TABLE table_181892_4 (year VARCHAR, race_status VARCHAR)
SELECT year FROM table_181892_4 WHERE race_status = "Piston"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_181892_4 (year VARCHAR, race_status VARCHAR) Question: What year(s) was the race status piston? [/INST] SELECT year FROM table_181892_4 WHERE race_status = "Piston" </s>