How to create conditional update trigger in sql server

Question

How to create conditional update trigger in sql server

Answer 1

You cant create a conditional update trigger. Once you create an update trigger it will get called for every update action. However you could write logic inside it to make it do your activity based on your condition using IF condition statement
Say for example if you've table with 6 columns and you want some logic to be implemented on update trigger only if col3 and col5 are participating in update operation you can write trigger like this
CREATE TRIGGER Trg_TableName_Upd
ON TableName
FOR UPDATE
AS
BEGIN
IF UPDATE(Col3) OR UPDATE (Col5)
BEGIN
....your actual logic here
END
END
UPDATE() function will check if column was involved in update operation and returns a boolean result
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