ORA-04079：始终无效的触发器规范

Question

create or replace trigger after_insert_ELECTONICS1
after insert on ELECTRONICS
on each row
declare
a number;
b varchar2(50);
c blob;
d varchar2(50);
e number;
f number;
g timestamp(6);
h varchar2(20);
begin
select (post_id,title,,photo,product_type,user_user_id,product_product_id,time_date,city)
into 
(a,b,c,d,e,f,g,h) 
from ELECTRONICS;
insert into post values (a,b,c,d,e,f,g,h);
end;

这是什么问题？ 我已经阅读了很多你给出的答案。 但我无法找到问题