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[ת] ½âÎöoracleµÄROWNUM ×÷Õß: chen_liang

¶ÔÓÚrownumÀ´ËµËüÊÇoracleϵͳ˳Ðò·ÖÅäΪ´Ó²éѯ·µ»ØµÄÐеıàºÅ£¬·µ»ØµÄµÚÒ»ÐзÖÅäµÄÊÇ1£¬µÚ¶þÐÐÊÇ2£¬ÒÀ´ËÀàÍÆ£¬Õâ¸öα×ֶοÉÒÔÓÃÓÚÏÞÖÆ²éѯ·µ»ØµÄ×ÜÐÐÊý£¬¶øÇÒrownum²»ÄÜÒÔÈκαíµÄÃû³Æ×÷Ϊǰ׺¡£
 ¾ÙÀý˵Ã÷£º
ÀýÈç±í£ºstudent(ѧÉú)±í£¬±í½á¹¹Îª£º
ID¡¡¡¡¡¡    char(6)¡¡¡¡¡¡¡¡¡¡ --ѧºÅ
name¡¡¡¡¡¡¡¡VARCHAR2(10)¡¡¡¡¡¡--ÐÕÃû
create table student (ID char(6), name VARCHAR2(100));
insert into sale values('200001',‘ÕÅÒ»’);
insert into sale values('200002',‘Íõ¶þ’);
insert into sale values('200003',‘ÀîÈý’);
insert into sale values('200004',‘ÕÔËÄ’);
commit;
(1) rownum ¶ÔÓÚµÈÓÚijֵµÄ²éѯÌõ¼þ
Èç¹ûÏ£ÍûÕÒµ½Ñ§Éú±íÖеÚÒ»ÌõѧÉúµÄÐÅÏ¢£¬¿ÉÒÔʹÓÃrownum=1×÷ΪÌõ¼þ¡£µ«ÊÇÏëÕÒµ½Ñ§Éú±íÖеڶþÌõѧÉúµÄÐÅÏ¢£¬Ê¹ÓÃrownum=2½á¹û²é²»µ½Êý¾Ý¡£ÒòΪrownum¶¼ÊÇ´Ó1¿ªÊ¼£¬µ«ÊÇ1ÒÔÉϵÄ×ÔÈ»ÊýÔÚrownum×öµÈÓÚÅжÏÊÇʱÈÏΪ¶¼ÊÇfalseÌõ¼þ£¬ËùÒÔÎÞ·¨²éµ½rownum = n£¨n>1µÄ×ÔÈ»Êý£©¡£
SQL> select rownum,id,name from student where rownum=1;£¨¿ÉÒÔÓÃÔÚÏÞÖÆ·µ»Ø¼Ç¼ÌõÊýµÄµØ·½£¬±£Ö¤²»³ö´í£¬È磺ÒþʽÓα꣩
SQL> select rownum,id,name from student where rownum=1;
    ROWNUM ID     NAME
---------- ------ ---------------------------------------------------
         1 200001 ÕÅÒ»
SQL> select rownum,id,name from student where rownum =2;
    ROWNUM ID     NAME
---------- ------ ---------------------------------------------------
£¨2£©rownum¶ÔÓÚ´óÓÚijֵµÄ²éѯÌõ¼þ
   Èç¹ûÏëÕÒµ½´ÓµÚ¶þÐмǼÒÔºóµÄ¼Ç¼£¬µ±Ê¹ÓÃrownum>2ÊDz鲻³ö¼Ç¼µÄ£¬Ô­ÒòÊÇÓÉÓÚrownumÊÇÒ»¸ö×ÜÊÇ´Ó1¿ªÊ¼µÄαÁУ¬Oracle ÈÏΪrownum> n(n>1µÄ×ÔÈ»Êý)ÕâÖÖÌõ¼þÒÀ¾É²»³ÉÁ¢£¬ËùÒԲ鲻µ½¼Ç¼
SQL> select rownum,id,name from student where rownum >2;
ROWNUM ID     NAME
---------- ------ ---------------------------------------------------
ÄÇÈçºÎ²ÅÄÜÕÒµ½µÚ¶þÐÐÒÔºóµÄ¼Ç¼ѽ¡£¿ÉÒÔʹÓÃÒÔϵÄ×Ó²éѯ·½·¨À´½â¾ö¡£×¢Òâ×Ó²éѯÖеÄrownum±ØÐëÒªÓбðÃû£¬·ñÔò»¹ÊDz»»á²é³ö¼Ç¼À´£¬


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¹ØÓÚORACLE¸¨ÖúÓï¾ä

--JOBS
DECLARE
X NUMBER;
BEGIN
SYS.DBMS_JOB.SUBMIT(job => X,
what => 'sp_test();',
next_date => to_date('28-04-2009 11:58:00',
'dd/mm/yyyy hh24:mi:ss'),
interval => 'SYSDATE+1');
END;
/
commit;
select to_char(sysdate-90,'yyyymmdd') from dual;  --Ñ¡ÔñÈÕÆÚ
select * from ......

ѧϰ¡¶Oracle 9i10g±à³ÌÒÕÊõ¡·µÄ±Ê¼Ç (¾Å) ½ø³Ì

1.Oracle ʵÀýÖ÷ÒªÓÐ3 Àà½ø³Ì
Oracle Öеĸ÷¸ö½ø³ÌÒªÍê³Éij¸öÌØ¶¨µÄÈÎÎñ»òÒ»×éÈÎÎñ£¬Ã¿¸ö½ø³Ì¶¼»á·ÖÅäÄÚ²¿Äڴ棨PGA Äڴ棩À´
Íê³ÉËüµÄÈÎÎñ¡£Oracle ʵÀýÖ÷ÒªÓÐ3 Àà½ø³Ì£º
·þÎñÆ÷½ø³Ì£¨server process£©£ºÕâЩ½ø³Ì¸ù¾Ý¿Í»§µÄÇëÇóÀ´Íê³É¹¤×÷¡£ÎÒÃÇÒѾ­¶ÔרÓ÷þ
ÎñÆ÷ºÍ¹²Ïí·þÎñÆ÷ÓÐÁËÒ»¶¨µÄÁ˽⡣ËüÃǾÍÊÇ·þÎñÆ÷½ø³Ì¡£
º ......

aixϰ²×°oracleÐĵÃ

ɾ³ýAIXϵÄORACLE
===========================================================
×÷Õß: wmlm(http://wmlm.itpub.net)
·¢±íÓÚ:2008.12.02 18:17
·ÖÀà: oracle
³ö´¦£ºhttp://wmlm.itpub.net/post/12871/474762
---------------------------------------------------------------
rm -Rf /etc/oratab
rm -Rf /et ......

ORACLE to_charº¯ÊýÏê½â

 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 following is a list ......
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