Trigger in pl sql pdf

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Triggers in oracle are blocks of PL/SQL code which oracle engine can execute automatically based on some action or event. These events can be:. Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any You create a trigger with the CREATE TRIGGER statement. You specify the triggering event in terms of triggering statements and the item on which they act. The Stored procedures – groups of SQL and PL/SQL statements – allow you to move code that enforces business rules from your application to the database. Performance Triggers are PL/SQL programs that automatically fire (i.e. execute) when: Triggers can call database procedures, functions and packages. Triggers are simply stored procedures that are ran automatically by the database whenever some event (usually a table update) happens.A DML trigger is a trigger that is automatically fired. (executed) whenever an SQL DML statement (INSERT,. UPDATE, or DELETE) is executed. • You classify DML