通过触发器和自增序列实现oracle自增ID

create sequence seq_tablename
        start with 1
        increment by 1; 
 create or replace trigger tri_tablename_insert
         before insert on tablename
         referencing old as old new as new
         for each row
       begin
         select seq_tablename.nextval
           into :new.ID
           from dual;
       end tri_tablename_insert;
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