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create table departments (
department_id number(4),
department_name varchar2(40) constraint dept_name_nn not null,
manger_id number(6),
located_id number(4),
constraint dept_id_pk primary key(department_id));

À̶§ primary keyÀÇ index´Â dept_id_pk °¡ µÈ´Ù.
Áï constraintÀÇ À̸§°ú °°°Ô µÈ´Ù...


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