plsql - PL/SQL Oracle Trigger Before Insert Can't get New Unique Primary ID -


whats wrong...?? please check trigger

create or replace trigger tbl_ae_bi before update on tbl_ae referencing new new old old each row  declare kd_ae varchar2 (6);  begin    select ae_id kd_ae (   select kdmax,(select to_char('ae')kd dual)||         (case when kdmax>=0 ,  kdmax<10 '000'||kdmax               when kdmax>=10 ,  kdmax<100 '00'||kdmax               when kdmax>=100 ,  kdmax<1000 '0'||kdmax               else to_char(kdmax)          end)ae_id   (select (nvl(max(to_number(substr(ae_id,3,4))),0)+1)kdmax tbl_ae)   );    :new.ae_id:=kd_ae;   :new.insert_date:= sysdate;   end;

when insert new record table, result error cannot insert null ae_id.

but when execute in sql window following code 

select ae_id kd_ae ( select kdmax,(select to_char('ae')kd dual)||   (case when kdmax>=0 ,  kdmax<10 '000'||kdmax         when kdmax>=10 ,  kdmax<100 '00'||kdmax         when kdmax>=100 ,  kdmax<1000 '0'||kdmax         else to_char(kdmax)    end)ae_id (select (nvl(max(to_number(substr(ae_id,3,4))),0)+1)kdmax tbl_ae) )

result no error, , new unique id.

like

change before upate before insert

create or replace trigger tbl_ae_bi before insert --changed on tbl_ae referencing new new old old each row  declare kd_ae varchar2 (6);  begin    select ae_id kd_ae (   select kdmax,(select to_char('ae')kd dual)||         (case when kdmax>=0 ,  kdmax<10 '000'||kdmax               when kdmax>=10 ,  kdmax<100 '00'||kdmax               when kdmax>=100 ,  kdmax<1000 '0'||kdmax               else to_char(kdmax)          end)ae_id   (select (nvl(max(to_number(substr(ae_id,3,4))),0)+1)kdmax tbl_ae)   );    :new.ae_id:=kd_ae;   :new.insert_date:= sysdate;   end;

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