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Tell us what is a Trigger?


A Trigger is a SQL procedure that initiates an action in response to an event (Insert, Delete or Update) occurs. When a new Employee is added to an Employee_Details table, new records will be created in the relevant tables such as Employee_Payroll, Employee_Time_Sheet etc.,

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Tell me referential integrity and where it can be enforced?Tell us what is the difference between an inner and outer join?