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[Ìõ¼þ3]ÏÞ¶¨×÷ΪËÑË÷ÆðʼµãµÄÌõ¼þ£¬Èç¹ûÊÇ×ÔÉ϶øÏµÄËÑË÷ÔòÊÇÏÞ¶¨×÷Ϊ¸ù½ÚµãµÄÌõ¼þ£¬Èç¹ûÊÇ×Ô϶øÉϵÄËÑË÷ÔòÊÇÏÞ¶¨×÷ΪҶ×Ó½ÚµãµÄÌõ¼þ£»
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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;
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    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£©¡£
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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*/
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