Trigger in Oracle
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Trigger for comparing an employee's salary with that his or her supervisor.
Explain why this Trigger is not work.
CREATE TRIGGER INFORM_SUPERVISOR1
BEFORE INSERT OR UPDATE OF SALARY, SUPERVISOR_SSN ON EMPLOYEE
FOR EACH ROW
WHEN
(NEW.SALARY > (SELECT SALARY FROM EMPLOYEE
WHERE SSN=NEW.SUPERVISOR_SSN))
INFORM_SUPERVISOR(NEW.SUPERVISOR_SSN,NEW.SSN);
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Trigger in Oracle is modeled.
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