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Perhatikan definisi tabel berikut
CREATE TABLE EMPLOYEE ( Ssn VARCHAR PRIMARY KEY, Fname VARCHAR, Salary NUMERIC, Super_ssn VARCHAR REFERENCES EMPLOYEE(Ssn), Dno INT);
Pilihlah trigger dan stored procedure yang paling tepat untuk memastikan bahwa tidak ada supervisor (Super_ssn) yang berbeda departemen dari pegawai yang dia supervisi.
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