CREATE TABLE table_31686 ("Rank" FLOAT, "Player" TEXT, "Career" TEXT, "Caps" FLOAT, "Goals" FLOAT)

What is the maximum cap number where 0 goals were scored with a rank of 15?
SELECT MAX("Caps") FROM table_31686 WHERE "Goals" = '0' AND "Rank" = '15'
SELECT MAX("Caps") FROM "table_31686" WHERE "Goals" = '0' AND "Rank" = '15'