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1¡¢ 
Á¬½ÓÊý¾Ý¿â
connect uuu/ooo
connect 
sys/ok as sysdba
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create tablespace stu(±í¿Õ¼äÃû
) datafile 

e:\stu.dbf

 size 100m autoextend on next 5m maxsize 500m;
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drop tablespace stu including contents and datafiles;
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create user uuu(Óû§Ãû
) identified by uuu(
ÃÜÂë
) default tablespace stu(
±í¿Õ¼äÃû
);
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alter user uuu identified by ppp(xÐÂÃÜÂë
);
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drop user uuu casoade;
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alter user uuu account lock;
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alter user uuu account unlock;
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grant all to uuu(Óû§Ãû
);
//ÊÚȨËùÓÐȨÏÞ
grant create session to uuu;
//ÊÚȨÁ¬½ÓÊý¾Ý¿âȨÏÞ
grant connect,resource to uuu;
10¡¢ 
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select * from user_sys_privs;
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revoke all from uuu;
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create table STUDENT
(
  STUNO    VARCHAR2(20) not null,
  STUNAME  VARCHAR2(50),
  BIRTHDAY DATE,
  XUELI    VARCHAR2(10),
  SEX      INTEGER
)
tablespace STUDB
;
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drop table student;
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alter table student 
add constraint
 pk_stuno
 
primary key(stuNo);
´´½¨check
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alter table 
student
 add constraint 
ck_name 
check (
saly>100
);
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alter table STUDENT add constraint FK_SEX foreign key (SEX) refe


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The following are number examples for the to_char
function.
to_char
(1210.73,
'9999.9')
would return '1210.7'
to_char
(1210.73,
'9,999.99')
would return '1,210.73'
to_char
(1210.73,
'$9,999.00')
would return
'$1,210.73'
to_char
(21,
'000099')
would return '000021'
The foll ......

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 decode(A.type,
    'MR', 'Media Recovery',
    'RT','Redo Thread',
    'UN','User Name',
    'TX', 'Transaction',
    'TM', ' ......

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