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Oracle Rowid ½éÉÜ

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SQL> conn sys/admin as sysdba
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SQL> create table bl(id number);
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SQL> insert into bl values(1);
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SQL> select owner,segment_name,file_id,RELATIVE_FNO,block_id from dba_extents wh
ere owner='SYS' and segment_name='BL';
OWNER SEGMENT_NA   FILE_ID  RELATIVE_FNO   BLOCK_ID
-----    ----------           ----------    ------------          ----------
SYS    BL                  1           1            62129
 
SQL> desc dbms_rowid.rowid_info
PACKAGE SYS.DBMS_ROWID
PROCEDURE ROWID_INFO
 Argument Name                  Type                    In/Out
 ------------------------------ ----------------------- ------
 ROWID_IN                       ROWID                   IN   
 ROWID_TYPE                     NUMBER                  OUT   
 OBJECT_NUMBER                  NUMBER           


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Username
Password
Description
See Also
CTXSYS
CTXSYS
The Oracle Text account
Oracle Text Reference
DBSNMP
DBSNMP
The account used by the Management Agent component of Oracle Enterprise Manager to monitor and manage the database
Oracle Enter ......

Oracle³£¼ûº¯Êý´óÈ«

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SQL> select ascii('A') A,ascii('a') a,ascii('0') zero,ascii(' ') space from dual;
       A       A    ZERO     SPACE
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OracleÈÕÆÚº¯Êý¼¯½õ(¶þ)

OracleÈÕÆÚº¯Êý¼¯½õ(¶þ)
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1.trunc(sysdate,'Q') ±¾¼¾¶ÈµÚÒ»Ìì
SQL> select trunc(sysdate,'Q') from dual;
TRUNC(SYSDATE,'Q')
------------------
2007-4-1
2.trunc(sysdate,'D') ±¾ÖܵĵÚÒ»Ìì(ÖÜÈÕ)
SQL> select trunc(sysdate,'D')from dual;
TRUNC(SYSDATE,'D')
------------------
2 ......

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