The term "trigger function" is a simply a way of referring to a function that is intended to be invoked by a trigger. Triggers define operations that are performed when a specific event occurs within the database. A PostgreSQL trigger function can be referenced by a trigger as the operation to be performed when the trigger's event occurs

Create a Trigger Function

To create a trigger function :

1. Select the Database in the Tree View and select Others > Trigger Function from the toolbar
   
2. Press the New Trigger Function button
   
3. Enter Trigger Function properties and fields on the appropriate tabs of the New Trigger Function Editor
4. Click OK

Design a Trigger Function

To design a trigger function:

1. Select the Database in the Tree View and select Others > Trigger Function from the toolbar
2. Select the trigger function you want to design.
   
3. Press the Design Trigger Function button.
   
4. Edit Trigger Function properties and fields on the appropriate tabs of the Design Trigger Function Editor
5. Click OK
   

Delete a Trigger Function

To delete a trigger function:

1. Select the Database in the Tree View and select Others > Trigger Function from the toolbar
2. Select the trigger function you want to delete.
   
3. Click the Delete Trigger Function button.
4. Confirm deleting in the dialog window.