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Interview Q & A >> SQL Server >> What are the types of Triggers?

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What are the types of Triggers? (Views: 1326)


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Triggers are a special class of stored procedure defined to execute automatically when an UPDATE, INSERT, or DELETE statement is issued against a table or view. Triggers are powerful tools that sites can use to enforce their business rules automatically when data is modified.
The CREATE TRIGGER statement can be defined with the FOR UPDATE, FOR INSERT, or FOR DELETE clauses to target a trigger to a specific class of data modification actions. When FOR UPDATE is specified, the IF UPDATE (column name) clause can be used to target a trigger to updates affecting a particular column.
Types of Triggers:
AFTER (default) - The trigger executes after the statement that triggered it completes. If the statement fails with an error, such as a constraint violation or syntax error, the trigger is not executed. AFTER triggers cannot be specified for views.
INSTEAD OF - The trigger executes in place of the triggering action. INSTEAD OF triggers can be specified on both tables and views. You can define only one INSTEAD OF trigger for each triggering action (INSERT, UPDATE, and DELETE). INSTEAD OF triggers can be used to perform enhance integrity checks on the data values supplied in INSERT and UPDATE statements.INSTEAD OF triggers also let you specify actions that allow views, which would normally not support updates, to be updatable.

Submitted By: Anonymous | Created On: 5/16/2009 5:07:33 PM



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