Create and execute triggers

Create and execute triggers

Triggers in SQL Server 2008 are database objects that are automatically executed in response to certain events, such as an INSERT, UPDATE, or DELETE operation on a table. Triggers can be used to enforce business rules, maintain data integrity, and perform automated auditing and logging.

To create a trigger in SQL Server 2008, you first need to define the trigger’s action, which is the code that will be executed when the trigger is fired. This code can be written in any language supported by SQL Server, such as T-SQL, C#, or Visual Basic.

Once you have defined the trigger’s action, you need to specify the trigger’s event, which is the database operation that will cause the trigger to fire. This can be done using the CREATE TRIGGER statement, which includes the name of the trigger, the event that will trigger the trigger, and the action that will be executed when the trigger is fired.

For example, the following statement creates a trigger that will execute when an INSERT operation is performed on the SalesOrders table:

CREATE TRIGGER trg_SalesOrders_Insert ON SalesOrders AFTER INSERT AS BEGIN -- trigger action here END

Once the trigger has been created, it will be executed automatically whenever the specified event occurs. To modify or remove a trigger, you can use the ALTER TRIGGER or DROP TRIGGER statements, respectively.

It is important to use triggers judiciously, as they can add overhead to database operations and make it more difficult to maintain and debug the database schema. However, when used correctly, triggers can be a powerful tool for enforcing data integrity and automating common database tasks.

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