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