Oracle»¥»»×ܽá
Oracle»¥»»×ܽá
1. ¶àÐл»³ÉÒ»ÐÐ
col1 col2 col1 col2
a 1
a 2 ת»»ºó a 1,2,3
a 3
A.
sys_connect_by_path
º¯Êý
SELECT NAME, ltrim(MAX(sys_connect_by_path(userid, ',')), ',') userid
from(SELECT NAME, userid,row_number() over(PARTITION BY NAME ORDER BY userid) rn from test) START WITH rn = 1 CONNECT BY rn - 1 = PRIOR rn AND NAME = PRIOR NAME GROUP BY NAME ORDER BY NAME;
B.wmsys.WM_CONCATº¯Êý
select NAME,wmsys.WM_CONCAT(userid) from xj_class group by NAME;
2. Ò»Ð뻶àÐÐ
col col
1,2,3 ת»»ºó 1
2
3
select substr(subjec
Ïà¹ØÎĵµ£º
1.Ñ¡ÓÃÊʺϵÄOracleÓÅ»¯Æ÷
OracleµÄÓÅ»¯Æ÷¹²ÓÐ3ÖÖ£º
a.RULE(»ùÓÚ¹æÔò)
b.COST(»ùÓڳɱ¾)
c.CHOOSE(Ñ¡ÔñÐÔ)
ÉèÖÃȱʡµÄÓÅ»¯Æ÷£¬¿ÉÒÔͨ¹ý¶Ôinit.oraÎļþÖÐOPTIMIZER_MODE²ÎÊýµÄ
¸÷ÖÖÉùÃ÷£¬ÈçRULE¡¢COST¡¢CHOOSE¡¢ALL_ROWS¡¢FIRST_ROWS¡£Ä㵱ȻҲÔÚSQL¾ä¼¶»òÊǻỰ(session)¼¶¶ÔÆä½øÐи²
¸Ç¡£
ΪÁËʹÓûùÓڳɱ¾µÄÓÅ»¯Æ ......
http://blog.csdn.net/lzysystem/archive/2009/03/05/3960853.aspx
http://www.linuxidc.com/Linux/2009-06/20390.htm
http://www.linuxdiyf.com/viewarticle.php?id=163893
http://blog.sina.com.cn/s/blog_4ed66efa0100gfjx.html### ......
ORACLE SQLÐÔÄÜÓÅ»¯
ÎÒÒª½²µÄÌâÄ¿ÊÇOracle SQLÐÔÄÜÓÅ»¯£¬Ö»ÊÇOracleÐÔÄÜÓÅ»¯ÖеÄÒ»Ïî¡£OracleµÄÐÔÄÜÓÅ»¯°üº¬ºÜ¶à·½Ã棬±ÈÈçµ÷ÕûÎïÀí´æÈ¡£¬µ÷ÕûÂß¼´æÈ¡£¬µ÷ÕûÄÚ´æʹÓ㬼õÉÙÍøÂçÁ÷Á¿µÈ¡£ÕâÀïÑ¡ÔñSQLÐÔÄÜÓÅ»¯ÊÇÒòΪÕⲿ·ÖÄÚÈÝÎÒÃDzâÊÔÈËÔ±×îÈÝÒ×½Ó´¥µ½£¬ÁíÍ⿪·¢ÈËԱдSQL½Å±¾Ê±ÓÐʱºÜËæÒ⣬²»Öª²»¾õ¾Í»áÔì³É³ÌÐòÐÔÄÜÉϵÄÏ ......
PowerBuilderÈ¡µÃ¾Þ´ó³É¾ÍµÄÔÒò¾ÍÊÇÓй¦ÄÜÇ¿´óºÍÁé»î¶à±äµÄDatawindow¶ÔÏ󣬱¾ÈËÓÃPowerBuilder¿ª·¢¹ýÒ»¶Îʱ¼äºó£¬×ܽá³öһЩ¼¼ÇÉ£¬ÒÔ¹©¹ã´óµÄPB¿ª·¢Õß½è¼øʹÓá£
1¡¢ ÈçºÎ´´½¨Ò»¸ö¾ßÓÐÖð½¥µÝÔöÇóºÍ¹¦Äܵı¨±í£¬ÈçÏÂÐÎʽ£º Running TotalÁУ¬ÎÒÃÇ¿ÉʹÓüÆËãÁУºCumulativeSum£¨Quantity for all£©£¬¼´¿É´ïµ½Öð½¥µÝÔöÇóºÍ ......
ÔÎĵØÖ·£ºhttp://arvinnan.javaeye.com/blog/308638
²Î¿¼
http://www.blogjava.net/wxqxs/archive/2008/10/13/237180.html?opt=admin
http://hi.baidu.com/ray315/blog/item/153c97a33cd26caacbefd0de.html
¶¨Òå
External tables access data in
external s ......