[Query] Merge Into(다량의 건 일괄로)

MERGE INTO TB_ATTB T
USING(
  SELECT
        A.REQ_NO      
      , B.TEST_RST
      , 'Y'   USE_YN
      , '0'  INST_ID
      , SYSDATE    INST_DS
      , '0'  UPDT_ID 
      , SYSDATE    UPDT_DS
    FROM TB_MST A
      ,  TB_DTL B
    WHERE 1=1 
    AND A.REQ_NO = B.REQ_NO  
    AND B.ITEM_CD IN ('S0B70', 'S0B710')
    AND A.REQ_DT BETWEEN '20130726' AND '20130825'
) S
ON (S.REQ_NO = T.REQ_NO AND S.ATTB_ID = T.ATTB_ID)
WHEN MATCHED THEN 
  UPDATE SET   
   T.ATTB_VAL  = S.TEST_RST
  , T.USE_YN    = S.USE_YN    
  , T.UPDT_ID   = S.UPDT_ID
  , T.UPDT_DS   = S.UPDT_DS    
WHEN NOT MATCHED THEN 
  INSERT(
     T.REQ_NO
  ,  T.ATTB_ID
  ,  T.ATTB_VAL
  ,  T.USE_YN
  ,  T.INST_ID
  ,  T.INST_DS
  ,  T.UPDT_ID
  ,  T.UPDT_DS
  )
  VALUES(
     S.REQ_NO
  ,  S.ATTB_ID
  ,  S.TEST_RST
  ,  S.USE_YN
  ,  S.INST_ID
  ,  S.INST_DS
  ,  NULL
  ,  NULL
  )    
;