create or replace trigger t

before update on test5

for each row

begin

insert into test55 values (:old.id,:old.name);

end ;

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--表中插入数据时ID自动增长

create table ttt (id number primary key ,name varchar2(20),age number(2))

create or replace trigger gger_tt

before insert on ttt

for each row

when (new.id is null)

begin

select ttt_sequence.nextval into :new.id from dual;

end;

insert into ttt(name) values('明')