CREATE TABLE table_8497 ("Club" CLOB, "Played" CLOB, "Drawn" CLOB, "Lost" CLOB, "Points for" CLOB, "Points against" CLOB, "Points difference" CLOB, "Points" CLOB)

What is the points difference for the team that has allowed 615 points against?
SELECT "Points difference" FROM table_8497 WHERE "Points against" = '615'
SELECT "Points difference" FROM "table_8497" WHERE "Points against" = '615'