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[oracle@wuzj ~]$ sqlplus /nolog
SQL*Plus: Release 10.2.0.1.0 - Production on Thu Feb 26 12:06:29 2009
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
SQL> conn /as sysdba
Connected.
//²é¿´Óû§
SQL> select username,password from dba_users;
......

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create table TN_TEST(
       username varchar2(32),
       userpass varchar2(32),
       version  number
)
ÒªÇóÒ»:
TN_TEST±íÖÐ×Ö¶Îversion
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crea ......

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alter table tablename modify(name ,varchar2(10)) Áпí¶È²»µÃСÓÚÐÞ¸ÄǰµÄ¿í¶È
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alter database add logfile 'd:\orcl01.log' size 10m;//Ìí¼Ó×é
alter database add logfile member 'd:\orcl02.log' to group 4;//Ïò4×éÖÐÌí¼Ó³ÉÔ±
alter database drop logfile member 'd: ......

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SQL> Select to_char(sysdate,'Y') from dual;
TO_CHAR(SYSDATE,'Y')
--------------------
7
SQL> Select to_char(sysdate,'YY') from dual;
TO_CHAR(SYSDATE,'YY')
---------------------
07
SQL> Select to_char(sysdate,'YYY') from ......
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