SELECT
    I.ITEM_CODE AS CODE,
    --I.ITEM_NAME AS I_NAME,
    --IH.ITEM_NAME AS IH_NAME,
    CASE
    WHEN I.ITEM_NAME = IH.ITEM_NAME THEN NULL
    WHEN I.ITEM_NAME <> IH.ITEM_NAME THEN I.ITEM_NAME
    WHEN IH.ITEM_NAME IS NULL THEN I.ITEM_NAME
    END AS NAME
FROM
    ITEM AS I
LEFT JOIN
    ITEM_HISTORY AS IH
ON
    I.ITEM_CODE = IH.ITEM_CODE