oralce高级应用update

MERGE INTO INFO_ENTERPRISE A USING(SELECT :enterprise_id ENTERPRISE_ID FROM DUAL) B
  ON (A.ENTERPRISE_ID = B.ENTERPRISE_ID) WHEN MATCHED THEN

//更改
  UPDATE SET  ENTERPRISE_NAME=:enterprise_name
 ,ENTERPRISE_NS =:enterprise_ns
 ,TYPE_CODE =:type_code
 ,SCALE_CODE =:scale_code
 ,ENTERPRISE_DESC =:enterprise_desc
         WHERE ENTERPRISE_ID = :enterprise_id
  WHEN NOT MATCHED THEN

//添加   
 INSERT (
 ENTERPRISE_ID
       ,ENTERPRISE_NAME)
 VALUES (
 :enterprise_id
 ,:enterprise_name)