CREATE TABLE table_203_569 (id NUMBER, "designation" CLOB, "classification" CLOB, "constellation" CLOB, "apparent magnitude" NUMBER)

what is the difference in apparent magnitude between m31 and m33 ?
SELECT ABS((SELECT "apparent magnitude" FROM table_203_569 WHERE "designation" = 'm31') - (SELECT "apparent magnitude" FROM table_203_569 WHERE "designation" = 'm33'))
SELECT ABS((SELECT "apparent magnitude" FROM "table_203_569" WHERE "designation" = 'm31') - (SELECT "apparent magnitude" FROM "table_203_569" WHERE "designation" = 'm33'))