SELECT T1.ITEM_CODE CODE
      ,CASE
          WHEN T2.ITEM_NAME IS NULL THEN T1.ITEM_NAME
          WHEN T1.ITEM_NAME = T2.ITEM_NAME THEN NULL
          WHEN T1.ITEM_NAME <> T2.ITEM_NAME THEN T1.ITEM_NAME
       END NAME
  FROM ITEM T1
  LEFT JOIN ITEM_HISTORY T2
    ON T1.ITEM_CODE = T2.ITEM_CODE
 ORDER BY T1.ITEM_CODE DESC
;