How To Create Triggers In PostgreSQL || How To Create Trigger Function In PostgreSQL || PostgreSQL

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How To Create Triggers In PostgreSQL || How To Create Trigger Function In PostgreSQL || PostgreSQL

Triggers are special types of functions that are called/invoked/executed/performed automatically as per the trigger event declaration. A trigger is usually set before or after updating, deleting, insert DML statements on a table. That means, whenever a record is to be inserted, updated, or deleted, based on the time of execution which can be before or after, the trigger executes. Generally, the execution of the Trigger is called “Trigger Fired”.

In PostgreSQL, to create a trigger and make it usable, the sequence of object creation will be:
• Create a Table on which a trigger to be implemented
• Create another table to keep logs, so we can see the Trigger work
• Create a Trigger Function that holds the trigger
• Create the Trigger Function and Define the Trigger Logic
• Perform Insert/Update/Delete Operations on the Table