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_15607589_2 (first_downs VARCHAR, points_against VARCHAR)

### Question ###
Name the first downs for points against being 0

### Accurate SQL ###

SELECT first_downs FROM table_15607589_2 WHERE points_against = 0