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ORACLE ÈçºÎ²úÉúÒ»¸öËæ»úÊý

ORACLE ÈçºÎ²úÉúÒ»¸öËæ»úÊý:DBMS_RANDOM
--1¡¢Ð¡Êý( 0 ~ 1)
     select dbms_random.value from dual ;
--2¡¢Ö¸¶¨·¶Î§ÄÚµÄСÊý ( 0 ~ 100 )
     select dbms_random.value(0,100) from dual ;
--3¡¢Ö¸¶¨·¶Î§ÄÚµÄÕûÊý ( 0 ~ 100 )
     select trunc(dbms_random.value(0,100)) from dual ;
--4¡¢³¤¶ÈΪ20µÄËæ»úÊý×Ö´®
     select substr(cast(dbms_random.value as varchar2(38)),0,10) from dual ;
--5¡¢Õý̬·Ö²¼µÄËæ»úÊý
     select dbms_random.normal from dual ;
--6¡¢Ëæ»ú×Ö·û´®
     select dbms_random.string('x', 3) from dual ;
     /* opt¿ÉȡֵÈçÏ£º
      'u','U'    :    ´óд×Öĸ
      'l','L'    :    Сд×Öĸ
      'a','A'    :    ´ó¡¢Ð¡Ð´×Öĸ
      'x','X'    :    Êý×Ö¡¢´óд×Öĸ
      'p','P'    :    ¿É´òÓ¡×Ö·û*/
--7¡¢Ëæ»úÈÕÆÚ
     select to_date(2454084+TRUNC(DBMS_RANDOM.VALUE(0,365)),'J') from dual ;
   /* ͨ¹ýÏÂÃæµÄÓï¾ä»ñµÃÖ¸¶¨ÈÕÆÚµÄ»ùÊý*/
     select to_char(sysdate,'J') from dual ;
--8¡¢Éú³ÉGUID
     select sys_guid() from dual ;
--Éú³É´ø·Ö¸ô·û(-)µÄGUIDµÄ×Ô¶¨Ò庯Êý
--create or replace function my_guid
return varchar2
is
    guid varchar(36);
    temp varchar(32);
begin
    temp:=sys_guid();
    guid:= substr(temp,1,8) || '-'
         ||substr(temp,9,4) || '-'
         ||substr(temp,13,4)|| '-'
         ||substr(temp,17,4)|| '-'
         ||substr(temp,21,12)


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select segment_name, bytes
from user_segments
where segment_type = 'TABLE';
»òÕß
   Select Segment_Name,Sum(bytes)/1024/1024 from User_Extents Group By Segment_Name
ÁíÒ»ÖÖ±íʵ¼ÊÊ¹Ó ......

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dc-test2<oracle>sqlplus /nolog
SQL*Plus: Release 10.2.0.4.0 - Production on Thu Feb 25 19:23:35 2010
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
SQL> desc v$datafile;
SP2-0640: Not connected
SP2-0641: "DESCRIBE" requires connection to server
SQL> conn / a ......

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dc-test2<oracle>sqlplus /nolog
SQL*Plus: Release 10.2.0.4.0 - Production on Thu Feb 25 22:44:25 2010
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
SQL> conn / as sysdba
Connected.
SQL> define
DEFINE _DATE           = ......

OracleÈÕÆÚº¯Êý

OracleÈÕÆÚº¯Êý¼¯½õ(Ò»)
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1.Y»òYY»òYYY ÄêµÄ×îºóһ룬Á½Î»»òÈýλ
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_ch ......
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