在列上的T SQL After Update Trigger之后获取更改的值

Question

I've only started exploring with triggers recently. I've set up my database mail function and all is working well. My trigger works perfectly if the column value is changed, but how do I get the value/row that changed?

USE [database]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER TRIGGER [dbo].[triggerName] ON [dbo].[tableName]
FOR UPDATE
AS

declare @cust varchar(100);


    if update(Column)
    BEGIN
    SET NOCOUNT ON
        set @cust = THE VALUE MUST GO HERE I ASSUME
    END
    EXEC msdb.dbo.sp_send_dbmail
    @recipients = 'someone@example.com', 
    @profile_name = 'ProfileName',
    @subject = 'Customer Information Changed', 
    @body = @cust;

Answer 1

Compare the values in inserted and deleted . If they are not the same, then the value changed.