Use Of Trigger In Database Explain

What Is The Use Of Trigger In Database, Explain Use Of Triggers 

Use of database triggers

A trigger can permit DML statements against a table only if they are issued, during regular business hours or on predetermined weekdays.
A trigger can also be used to keep an audit trail of a table along with the operation performed and the time on which the operation was performed.
It can be used to prevent invalid transactions.
Enforce complex security authorizations.

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