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