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 2. ´´½¨ÐòÁÐ:
    create sequence sq_blog_info
    start with 1
    increment by 1
    nomaxvalue
    nocycle
    cache 10;
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    create or replace trigger tg_blog_info
       before insert on blog_info for each row
    begin
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    end;
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    insert into blog_info (title) values('a');


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create or replace type emp_typ as object (
id number,
name varchar2(30),
sal number,
comm number,
member procedure change_comm(new_comm number),
member function get_info return  varchar2
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