A trigger is a special stored procedure. Its execution is not called by the program, nor is it started manually. It is triggered by an event. For example, when a table is operated ( insert, delete, update), it is activated. carried out. Triggers are often used to enforce data integrity constraints and business rules. Triggers can be found in the DBA_TRIGGERS , USER_TRIGGERS data dictionary.
The types of timers are 1, on-delay timer 2, off-delay timer 3, hold-type on-delay timer 4, pulse-type timer 5, and extended-pulse timer.
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