Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

OracleÖÐconnect by...start with...µÄʹÓÃ

Ò»¡¢Óï·¨
´óÖÂд·¨£ºselect * from some_table [where Ìõ¼þ1] connect by [Ìõ¼þ2] start with [Ìõ¼þ3];
ÆäÖÐ connect by Óë start with Óï¾ä°Ú·ÅµÄÏȺó˳Ðò²»Ó°Ïì²éѯµÄ½á¹û£¬[where Ìõ¼þ1]¿ÉÒÔ²»ÐèÒª¡£
[where Ìõ¼þ1]¡¢[Ìõ¼þ2]¡¢[Ìõ¼þ3]¸÷×Ô×÷Óõķ¶Î§¶¼²»Ïàͬ£º
[where Ìõ¼þ1]ÊÇÔÚ¸ù¾Ý“connect by [Ìõ¼þ2] start with [Ìõ¼þ3]”Ñ¡Ôñ³öÀ´µÄ¼Ç¼ÖнøÐйýÂË£¬ÊÇÕë¶Ôµ¥Ìõ¼Ç¼µÄ¹ýÂË£¬ ²»»á¿¼ÂÇÊ÷µÄ½á¹¹£»
[Ìõ¼þ2]Ö¸¶¨¹¹ÔìÊ÷µÄÌõ¼þ£¬ÒÔ¼°¶ÔÊ÷·ÖÖ§µÄ¹ýÂËÌõ¼þ£¬ÔÚÕâÀïÖ´ÐеĹýÂË»á°Ñ·ûºÏÌõ¼þµÄ¼Ç¼¼°ÆäϵÄËùÓÐ×ӽڵ㶼¹ýÂ˵ô£»
[Ìõ¼þ3]ÏÞ¶¨×÷ΪËÑË÷ÆðʼµãµÄÌõ¼þ£¬Èç¹ûÊÇ×ÔÉ϶øÏµÄËÑË÷ÔòÊÇÏÞ¶¨×÷Ϊ¸ù½ÚµãµÄÌõ¼þ£¬Èç¹ûÊÇ×Ô϶øÉϵÄËÑË÷ÔòÊÇÏÞ¶¨×÷ΪҶ×Ó½ÚµãµÄÌõ¼þ£»
ʾÀý£º
¼ÙÈçÓÐÈçϽṹµÄ±í£ºsome_table(id,p_id,name)£¬ÆäÖÐp_id±£´æ¸¸¼Ç¼µÄid¡£
select * from some_table t where t.id!=123 connect by prior t.p_id=t.id and t.p_id!=321 start with t.p_id=33 or t.p_id=66;
¶ÔpriorµÄ˵Ã÷£º
    prior´æÔÚÓÚ[Ìõ¼þ2]ÖУ¬¿ÉÒÔ²»Òª£¬²»ÒªµÄʱºòÖ»ÄܲéÕÒµ½·ûºÏ“start with [Ìõ¼þ3]”µÄ¼Ç¼£¬²»»áÔÚѰÕÒÕâЩ¼Ç¼µÄ×ӽڵ㡣ҪµÄʱºòÓÐÁ½ÖÖд·¨£ºconnect by prior t.p_id=t.id »ò connect by t.p_id=prior t.id£¬Ç°Ò»ÖÖд·¨±íʾ²ÉÓÃ×ÔÉ϶øÏµÄËÑË÷·½Ê½£¨ÏÈÕÒ¸¸½ÚµãÈ»ºóÕÒ×ӽڵ㣩£¬ºóÒ»ÖÖд·¨±íʾ²ÉÓÃ×Ô϶øÉϵÄËÑË÷·½Ê½£¨ÏÈÕÒÒ¶×Ó½ÚµãÈ»ºóÕÒ¸¸½Úµã£©¡£
¶þ¡¢Ö´ÐÐÔ­Àí
connect by...start with...µÄÖ´ÐÐÔ­Àí¿ÉÒÔÓÃÒÔÏÂÒ»¶Î³ÌÐòµÄÖ´ÐÐÒÔ¼°¶Ô´æ´¢¹ý³ÌRECURSE()µÄµ÷ÓÃÀ´ËµÃ÷£º
/* ±éÀú±íÖеÄÿÌõ¼Ç¼£¬¶Ô±ÈÊÇ·ñÂú×ãstart withºóµÄÌõ¼þ£¬Èç¹û²»Âú×ãÔò¼ÌÐøÏÂÒ»Ìõ£¬
Èç¹ûÂú×ãÔòÒԸüÇ¼Ϊ¸ù½Úµã£¬È»ºóµ÷ÓÃRECURSE()µÝ¹éѰÕҸýڵãϵÄ×ӽڵ㣬
Èç´ËÑ­»·Ö±µ½±éÀúÍêÕû¸ö±íµÄËùÓмǼ ¡£*/
for rec in (select * from some_table) loop
if FULLFILLS_START_WITH_CONDITION(rec) then
    RECURSE(rec, rec.child);
end if;
end loop;
/* ѰÕÒ×Ó½ÚµãµÄ´æ´¢¹ý³Ì*/
procedure RECURSE (rec in MATCHES_SELECT_STMT, new_parent IN field_type) is
begin
APPEND_RESULT_LIST(rec); /*°Ñ¼Ç¼¼ÓÈë½á¹û¼¯ºÏÖÐ*/
/*ÔٴαéÀú±íÖеÄËùÓмǼ£¬¶Ô±ÈÊÇ·ñÂú×ãconnect byºóµÄÌõ¼þ£¬Èç¹û²»Âú×ãÔò¼ÌÐøÏÂÒ»Ìõ£¬
Èç¹ûÂú×ãÔòÔÙÒԸüÇ¼Ϊ¸ù½Úµã£¬È»ºóµ÷ÓÃRECURSE()¼ÌÐøµÝ¹é


Ïà¹ØÎĵµ£º

´«ÖDz¥¿Í——Êý¾Ý¿âÖ®ORACLE£¨¶þ£©


¡¡¡¡1£© ÓÃSELECTÓï¾ä´Ó±íÖÐÌáÈ¡²éѯÊý¾Ý¡£Ó﷨Ϊ
¡¡¡¡SELECT [DISTINCT] {column1,column2,…} from tablename WHERE {conditions} GROUP BY {conditions} ORDER BY {expressions} [ASC/DESC]; 
¡¡¡¡ËµÃ÷£ºSELECT×Ó¾äÓÃÓÚÖ¸¶¨¼ìË÷Êý¾Ý¿âµÄÖÐÄÄЩÁУ¬from×Ó¾äÓÃÓÚÖ¸¶¨´ÓÄÄÒ»¸ö±í»òÊÓͼÖмìË÷Êý¾Ý¡£
¡¡¡¡2£© ......

µ÷ÊÔoracle»º´æÃüÖÐÂÊÀ´Ôö¼ÓÊý¾Ý¿âµÄЧÂÊ


ÏÂÃæÁ½ÆªÎÄÕÂÈ«²¿ÊÇתÌû~
Ô­µØÖ·£ºhttp://www.im80hou.com/html/oracle/2009/0722/824.html
ÀíÂÛ£º
ÄÚ´æÓëÓ²Å̵ÄËٶȲîÒ죬´ÓÄÚ´æÖжÁÈ¡Êý¾ÝÒª±È´ÓÓ²ÅÌÖжÁÈ¡Êý¾Ý¿ì10000±¶
ÖÚËùÖÜÖª£¬´ÓÄÚ´æÖжÁÈ¡Êý¾ÝÒª±È´ÓÓ²ÅÌÖжÁÈ¡Êý¾Ý¿ì10000±¶¡£ÕâÖ÷ÒªÊÇÄÚ´æÓëÓ²Å̵ÄËٶȲîÒìËùÔì³ÉµÄ¡£Îª´ËÔÚOracleÊý¾Ý¿âÖÐÌá³öÒ»¸öÊý¾Ý»º´æµÄ ......

ÈçºÎÔÚoracleÖе¼Èëµ¼³ödmpÊý¾Ý¿âÎļþ

OracleÊý¾Ýµ¼Èëµ¼³öimp/exp¾ÍÏ൱ÓÚoracleÊý¾Ý»¹Ô­Ó뱸·Ý¡£expÃüÁî¿ÉÒÔ°ÑÊý¾Ý´ÓÔ¶³ÌÊý¾Ý¿â·þÎñÆ÷µ¼³öµ½±¾µØµÄdmpÎļþ£¬impÃüÁî¿ÉÒÔ°ÑdmpÎļþ´Ó±¾µØµ¼Èëµ½Ô¶´¦µÄÊý¾Ý¿â·þÎñÆ÷ÖС£ ÀûÓÃÕâ¸ö¹¦ÄÜ¿ÉÒÔ¹¹½¨Á½¸öÏàͬµÄÊý¾Ý¿â£¬Ò»¸öÓÃÀ´²âÊÔ£¬Ò»¸öÓÃÀ´ÕýʽʹÓá£
 
Ö´Ðл·¾³£º¿ÉÒÔÔÚSQLPLUS.EXE»òÕßDOS£¨ÃüÁîÐУ©ÖÐÖ´Ð ......

(ת)oracleµÄdecodeº¯Êý

DECODEº¯ÊýÊÇORACLE PL/SQLÊǹ¦ÄÜÇ¿´óµÄº¯ÊýÖ®Ò»£¬Ä¿Ç°»¹Ö»ÓÐORACLE¹«Ë¾µÄSQLÌṩÁ˴˺¯Êý£¬ÆäËûÊý¾Ý¿â³§É̵ÄSQLʵÏÖ»¹Ã»Óд˹¦ÄÜ¡£DECODEÓÐʲôÓÃ; ÄØ£¿ Ïȹ¹ÔìÒ»¸öÀý×Ó£¬¼ÙÉèÎÒÃÇÏë¸øÖÇÐÇÖ°Ô±¼Ó¹¤×Ê£¬Æä±ê×¼ÊÇ£º¹¤×ÊÔÚ8000ÔªÒÔϵĽ«¼Ó20£¥£»¹¤×ÊÔÚ8000ÔªÒÔÉϵļÓ15£¥£¬Í¨³£µÄ×ö·¨ÊÇ£¬ÏÈÑ¡³ö¼Ç¼ ÖеŤ×Ê×Ö¶ÎÖµ? select ......

oracleÖеĽÇÉ«


oracle
ÖеĽÇÉ«
Ò»¡¢ºÎΪ½ÇÉ«£¿
¡¡¡¡ÎÒÔÚÇ°ÃæµÄƪ·ùÖÐ˵Ã÷ȨÏÞºÍÓû§¡£ÂýÂýµÄÔÚʹÓÃÖÐÄã»á·¢ÏÖÒ»¸öÎÊÌ⣺Èç¹ûÓÐÒ»×éÈË£¬
ËûÃǵÄËùÐèµÄȨÏÞÊÇÒ»ÑùµÄ£¬µ±¶ÔËûÃǵÄȨÏÞ½øÐйÜÀíµÄʱºò»áºÜ²»·½±ã¡£ÒòΪÄãÒª¶ÔÕâ×éÖеÄÿ¸öÓû§µÄȨÏÞ¶¼½øÐйÜÀí¡£
¡¡¡¡ÓÐÒ»¸öºÜºÃµÄ½â¾ö°ì·¨¾Í
ÊÇ£º½ÇÉ«¡£½ÇÉ«ÊÇÒ»×éȨÏ޵ļ¯ºÏ£¬½«½ÇÉ«¸³ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ