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                  create sequence ÐòÁÐÃû
                   minvalue 1(ÉèÖÃ1Ϊ×îСֵ)
                     maxvalues 1.0E28(orcale ĬÈÏ×î´óֵΪ1.0E28)
                  start with 1  ( ³õʼֵΪ1)
                  increment by 1 (²½³¤Îª1 ,Ò²¾ÍÊÇÿ´ÎÔö¼Ó1)
                  noorder (Õâ¸öÊÇÉèÖÃΪ ²»ÅÅÐò)
                  nocycle (Õâ¸öÊÇÉèÖÃΪ ²»Ñ­»·)
                  nocache(Õâ¸öÊÇÉèÖÃΪ  ûÓлº³å)
   È»ºóÊÇ´´½¨Ò»¸ö´¥·¢Æ÷£º
             create trigger ´¥·¢Æ÷Ãû  before insert on ±íÃû for each row
             as
             begin
             select ÐòÁÐÃû.nextval into :new.id from dual;
             end;                     
   ÕâÑùÒ»¸öID×ÔÔö±í¾Í´´½¨ÁË.
  


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