sql server db trigger when certain field changes

is there anyway to put a condition in a SQL server trigger to say fire when field "XYZ" changes ?

EDIT:

what is the correct SQL syntax to basically insert into a new field

开发者_开发问答

Field XZY has changes from Value A to value B

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the trigger will always fire but you can break it's execution by using UPDATE() and COLUMNS_UPDATED methods inside the trigger

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you can have a conditional section anywhere within your trigger statement using

IF UPDATE (column_name)
BEGIN
    IF (SELECT column_name FROM INSERTED) = 'B'
    BEGIN
        /* do something */
    END
END