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 net start oracleserviceORCL
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 1.´´½¨±í
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 Alter table ±íÃû
 modify(×Ö¶ÎÃû Êý¾ÝÀàÐÍ)
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 3.Ôö¼Ó±í×Ö¶Î
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 add(×Ö¶ÎÃû Êý¾ÝÀàÐÍ)
 4.ɾ³ý±í×Ö¶Î
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 5.´´½¨±í²¢¸´ÖÆÁíÒ»Õűí½á¹¹ºÍÊý¾Ý
 Create table ±íÃû as
 select * from table ±íÃû
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 insert into ±íÃû (¿ÉÑ¡×Ö¶ÎÃû)
 select * from ±íÃû
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 create tablespace stusys
  datafile 'd:\oracle\stusys.dbf'
 size 50m
 autoextend on;
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 create user wangwei identified by wangwei
 default tablespace stusys
 temporary tablespace temp;
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 grant connect to wangwei;
 grant resource to wangwei;
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 conn wangwei/wangwei
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 Ñ§Éú±íÖÐÓÐÒ»¸öÍâ¼ü¹ØÁª°à¼¶±í
 create table classlist(
 claid char(6) primary key,
 opdate date,
 manager char(8)
 );
 create table students(
 stuid int primary key,
 stuname char(8),
 claid char(8) references classlist
 );
------------------------------
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