CREATE OR REPLACE TRIGGER TRG_KC_SPRK_i
BEFORE INSERT ON KC_SPRK
FOR EACH ROW
DECLARE
vSCBH varchar2(40);
iCount NUMBER;
iFor number;
BEGIN
select t.bhqz into vSCBH from xt_djbhgz t where t.gzid=8;--这里是获取另一张表的某一个字段作为前缀，或者直接赋值也行： vSCBH ：= ‘GXCB_’
select count(1)+1 INTO iCount from KC_SPRK j where j.xzsj>=trunc(sysdate,'mm'); --这里是获取本张表的总数 + 1，并赋值给iCount
vSCBH:=vSCBH||to_char(sysdate,'yyyymm'); --这里是前缀+时间年月
FOR iFor IN 1..5-LENGTH(iCount) LOOP
vSCBH:=vSCBH||'0';
END LOOP;
:new.RK_DJH:=vSCBH||iCount;
END TRG_KC_SPRK_i;
效果：GXCB_20141100001 GXCB_20141100002 GXCB_20141100003
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