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_8497 ( "Club" text, "Played" text, "Drawn" text, "Lost" text, "Points for" text, "Points against" text, "Points difference" text, "Points" text )

### Question ###
What is the points difference for the team that has allowed 615 points against?

### Accurate SQL ###

SELECT "Points difference" FROM table_8497 WHERE "Points against" = '615'