CREATE TABLE table_51028 ("Club" CLOB, "Played" CLOB, "Drawn" CLOB, "Lost" CLOB, "Points for" CLOB, "Points against" CLOB, "Points difference" CLOB, "Bonus Points" CLOB, "Points" CLOB)

What are the points against with a points difference?
SELECT "Points against" FROM table_51028 WHERE "Points difference" = 'points difference'
SELECT "Points against" FROM "table_51028" WHERE "Points difference" = 'points difference'