SELECT 
    ITEM.ITEM_CODE AS CODE,
    CASE 
        WHEN ITEM.ITEM_NAME != ITEM_HISTORY.ITEM_NAME THEN ITEM.ITEM_NAME
        ELSE NULL
    END AS NAME
FROM
    ITEM
INNER JOIN 
    ITEM_HISTORY
ON
    ITEM.ITEM_CODE = ITEM_HISTORY.ITEM_CODE
ORDER BY 
    ITEM.ITEM_CODE DESC
LIMIT 10