Question

I have used SQL Server 2005. But I have not used triggers, please somebody help me to let me know what is trigger?

Types of trigger, how to use that in SQL Server 2005?

What are advantages and disadvantages to use triggers?

Thanks in advance

Answer 1

A trigger is a procedure that automatically executes when something happens in a database.

from wikipedia:

A database trigger is procedural code that is automatically executed
in response to certain events on a particular table or view in a
database. The trigger is mostly used for maintaining the integrity of
the information on the database. For example, when a new record
(representing a new worker) is added to the employees table, new
records should be created also in the tables of the taxes, vacations
and salaries

There is a lot of information about them online:

MSDN – CREATE TRIGGER

An Introduction to Triggers

Exploring SQL Server Triggers