Full example:
CREATE TRIGGER [dbo].[trig_020_Original_010_010_Gamechanger]
ON [dbo].[T_Original]
AFTER UPDATE
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
DECLARE @Old_Gamechanger int;
DECLARE @New_Gamechanger int;
-- Insert statements for trigger here
SELECT @Old_Gamechanger = Gamechanger from DELETED;
SELECT @New_Gamechanger = Gamechanger from INSERTED;
IF @Old_Gamechanger != @New_Gamechanger
BEGIN
INSERT INTO [dbo].T_History(ChangeDate, Reason, Callcenter_ID, Old_Gamechanger, New_Gamechanger)
SELECT GETDATE(), 'Time for a change', Callcenter_ID, @Old_Gamechanger, @New_Gamechanger
FROM deleted
;
END
END