Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE track ( track_id number, name text, location text, seating number, year_opened number )
TABLE: CREATE TABLE race ( race_id number, name text, class text, date text, track_id text )

### Question ###
List the race class with at least two races.

### Accurate SQL ###

SELECT class FROM race GROUP BY class HAVING COUNT(*) >= 2