CREATE TABLE table_12770 ("Position" FLOAT, "Club" CLOB, "Played" FLOAT, "Points" FLOAT, "Wins" FLOAT, "Draws" FLOAT, "Losses" FLOAT, "Goals for" FLOAT, "Goals against" FLOAT, "Goal Difference" FLOAT)

Which Goal Difference has 28 Points, and a Club of cd cartagena, more than 15 losses?
SELECT MAX("Goal Difference") FROM table_12770 WHERE "Points" = '28' AND "Club" = 'cd cartagena' AND "Losses" > '15'
SELECT MAX("Goal Difference") FROM "table_12770" WHERE "Club" = 'cd cartagena' AND "Losses" > '15' AND "Points" = '28'