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