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 table_18733814_2 (points_classification VARCHAR, stage VARCHAR)

### Question ###
When 19 is the stage who is the points classification?

### Accurate SQL ###

SELECT points_classification FROM table_18733814_2 WHERE stage = 19