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A trigger is a specification that the database should automatically execute a particular function whenever a certain type of operation is performed. A trigger can be defined to execute before or after an INSERT, UPDATE, or DELETE operation, either once per modified row, or once per SQL statement. If a trigger event occurs, the trigger fires. You can also specify a trigger to fire only when a specified column(s) are affected by the query and to set a condition to control over whether a trigger is fired (PostgreSQL 9.0).

Triggers are created within Create Trigger Wizard. In order to run the wizard you should either

•	open the table in Table Editor and the Triggers tab there;

•	press the Insert key or select the Add New Trigger... item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar)

•	select the table in the explorer tree and use the Create New Trigger... popup menu item

•	select the table Triggers node or any trigger within the table in the explorer tree and use the Add New Trigger... popup menu item.

Triggers are edited within the Trigger Editor dialog window. In order to open the dialog you should either

•	open the table in Table Editor and the Triggers tab there;

•	press the Enter key or select the Edit Trigger item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar)

•	select the trigger to edit in the explorer tree and use the Edit Trigger popup menu item.

You can change the name of the trigger using the Rename Trigger dialog. To open the dialog you should either

•	select the trigger to rename in the explorer tree;

•	select the Rename Trigger item from the popup menu

•	open the table in Table Editor and the Triggers tab there;

•	select the trigger to rename;

•	select the Rename Trigger item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar).

To drop the trigger:

•	select the trigger to drop in the explorer tree;

•	select the Drop Trigger item from the popup menu

•	open the table in Table Editor and the Triggers tab there;

•	press the Delete key or select the Drop Trigger item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar)

and confirm dropping in the dialog window.