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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An introduction to Mutexes in 10gR2
By Connie Green, Kumar Rajamani
from meetings with: Kumar Rajamani, Russell Green, Saureen Shah, Cecilia Gervasio and Connie Green
Introduction
This paper is intended as an introduction to mutexes. It describes new concepts associated with mutexes, when ......
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as
begin
insert into dept values(deptno,dname,loc);
end;
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