Database Trigger - Triggers in Microsoft SQL Server

Triggers in Microsoft SQL Server

Microsoft SQL Server supports triggers either after or instead of an insert, update or delete operation. They can be set on tables and views with the constraint that a view can be referenced only by an INSTEAD OF trigger.

Microsoft SQL Server 2005 introduced support for Data Definition Language (DDL) triggers, which can fire in reaction to a very wide range of events, including:

• Drop table
• Create table
• Alter table
• Login events

A full list is available on MSDN.

Performing conditional actions in triggers (or testing data following modification) is done through accessing the temporary Inserted and Deleted tables.