Microsoft SQL:07 - Triggers

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 of the following events: – A database manipulation (DML) statement (DELETE, INSERT, or UPDATE).
– A database definition (DDL) statement (CREATE, ALTER, or DROP).
– A database operation (SERVERERROR, LOGON, LOGOFF, STARTUP, or SHUTDOWN).
Triggers could be defined on the table, view, schema, or database with which the event is associated.
A trigger is a special kind of a store procedure that executes in response to certain action on the table like insertion, deletion or updation of data.
It is a database object which is bound to a table and is executed automatically.
You can’t explicitly invoke triggers.
The only way to do this is by performing the required action no the table that they are assigned to.