SELECT
    ITEM.ITEM_CODE AS CODE,
    CASE
        WHEN ITEM.ITEM_NAME <> ITEM_HISTORY.ITEM_NAME THEN ITEM.ITEM_NAME
        WHEN ITEM.ITEM_NAME = ITEM_HISTORY.ITEM_NAME THEN NULL
        ELSE ITEM.ITEM_NAME
    END AS "NAME"
FROM ITEM
LEFT OUTER JOIN ITEM_HISTORY ON ITEM.ITEM_CODE = ITEM_HISTORY.ITEM_CODE
ORDER BY ITEM.ITEM_CODE DESC;