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1.±à¼­±íµÄ×Ö¶Î
  ÐÞ¸ÄÒ»¸öÁеÄÊý¾ÝÀàÐÍ(Ò»°ãÏÞÓÚÐ޸ij¤¶È£¬ÐÞ¸ÄΪһ¸ö²»Í¬ÀàÐÍʱÓÐÖî¶àÏÞÖÆ):
  Óï·¨:
    ALTER TABLE ±íÃû MODIFY(ÁÐÃû Êý¾ÝÀàÐÍ);
 eg1:
   alter table skate_test modify (author number(10,0) )
   ÔÚÐÞ¸ÄÁеij¤¶Èʱºò,Ö»Äܱ༭±ÈÏÖÓÐ×Ö¶Îʵ¼Ê´æµÄ³¤¶È»¹Òª´ó,·ñÔòÌáʾÏÂÃæµÄ´íÎó:
     ORA-01441: ÎÞ·¨¼õСÁ㤶È, ÒòΪһЩֵ¹ý´ó
 eg2:
  
    alter table skate_test modify (author varchar2(10) )
   ÔÚÐÞ¸ÄÁеÄÊý¾ÝÀàÐ͵Äʱºò,ËùÐ޸ĵÄÁбØÐëΪ¿Õ,·ñÔòÌáʾÏÂÃæµÄ´íÎó:
     ORA-01439: Òª¸ü¸ÄÊý¾ÝÀàÐÍ, ÔòÒªÐ޸ĵÄÁбØÐëΪ¿Õ
2.Ôö¼ÓÒ»¸öÁÐ
  Óï·¨:
      ALTER TABLE ±íÃû ADD(ÁÐÃû Êý¾ÝÀàÐÍ);
   eg1£º
  
      ALTER TABLE skate_test ADD(author NUMBER(38,0) not null);
3.¸øÁиÄÃû£º
  Óï·¨:
     ALTER TABLE ±íÃû RENAME COLUMN µ±Ç°ÁÐÃû TO ÐÂÁÐÃû;
  eg1£º
   
     ALTER TABLE skate_test RENAME COLUMN author TO authorer_new
4.ɾ³ýÒ»¸öÁÐ
   Óï·¨:
    ALTER TABLE ±íÃû DROP COLUMN ÁÐÃû;
 
  eg1£º
 
    alter table skate_test drop column author
5.½«Ò»¸ö±í¸ÄÃû
  Óï·¨:
   ALTER TABLE µ±Ç°±íÃû RENAME TO бíÃû;
 
  eg1£º
  
   alter table skate_test rename to test_sakte
5.¸ø±í¼Ó×¢ÊÍ
 comment column on ±íÃû.ÁÐÃû is '×¢ÊÍÄÚÈÝ';   //Ð޸ıíµÄÁеÄ×¢ÊÍ
 
 COMMENT ON TABLE MOVO_NEW.TEST_SAKTE  IS '×¢ÊÍÄÚÈÝ';  //Ð޸ıíµÄ×¢ÊÍ
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