Which class had a vehicle of Nissan in 2007?
CREATE TABLE table_name_31 (class VARCHAR, vehicle VARCHAR, year VARCHAR)
SELECT class FROM table_name_31 WHERE vehicle = "nissan" AND year = 2007
### Context: CREATE TABLE table_name_31 (class VARCHAR, vehicle VARCHAR, year VARCHAR) ### Question: Which class had a vehicle of Nissan in 2007? ### Answer: SELECT class FROM table_name_31 WHERE vehicle = "nissan" AND year = 2007