UPDATE() function with Trigger in SQL Server 2005:

UPDATE() function in Trigger will is one of the very useful function related to trigger. UPDATE() function will help you to know that which column is going to update. Let us see how will it work?

--create table1 for demo

CREATE TABLE CustInfo

(

CustId INT Identity(1,1),

Name VARCHAR(10),

Country Varchar(10),

)

GO

--insert records in above table

INSERT INTO CustInfo

SELECT 'RITSEH',’India’ UNION ALL

SELECT 'RAJAN' ,’Hindustan’

GO

--CREATE trigger to check which field

--we are updating

CREATE TRIGGER UpdateCheck ON CustInfo

AFTER UPDATE

AS

IF UPDATE(Name)

BEGIN

PRINT 'YOU HAVE UPDATED NAME FIELD'

END

ELSE

BEGIN

PRINT 'YOU HAVE NOT UPDATED NAME FIELD'

END

--check this out

UPDATE CustInfo SET Name ='R.Shah' WHERE Name='RAJAN'

As we are updating Name field, we will see first message as condition will fall in IF part.

Reference: Ritesh Shah
http://www.sqlhub.com
Note: Microsoft Books online is a default reference of all articles but examples and explanations prepared by Ritesh Shah, founder of http://www.SQLHub.com