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 CLASS (class_room VARCHAR)

### Question ###
Find the number of classes offered for all class rooms that held at least 2 classes.

### Accurate SQL ###

SELECT COUNT(*), class_room FROM CLASS GROUP BY class_room HAVING COUNT(*) >= 2