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Oracle???????????????

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???????????tb_distree????????

create table tb_distree
(
    id number,
    name varchar2(300),
    pid number
);

???????????????

alter table tb_distree 
add 
(
    constraint pk_id primary key(id),
    constraint fk_pid foreign key(pid) references tb_distree(id)
);

????

????????????

insert into tb_distree(id,name) values(1,'

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