Trigger

In the context of databases, a trigger is a special type of stored procedure that is automatically executed or fired in response to certain events or actions occurring in a database. These events can include data manipulation operations such as inserting, updating, or deleting records in a table.

Triggers are often used to enforce data integrity rules, perform calculations or validations, or automate certain tasks when specific conditions are met. They can be defined to execute before or after the triggering event, and can be set to fire once for each affected row or once for each statement.

Triggers can be a powerful tool for maintaining data consistency and automating routine tasks in a database system. However, they should be used judiciously and with caution, as poorly designed or inefficient triggers can impact performance and lead to unexpected behavior.