SQL Server Trigger to tracking last data updates

USE Northwind;
GO
IF OBJECT_ID ('TableUpdateTrigger','TR') IS NOT NULL
    DROP TRIGGER TableUpdateTrigger;
GO

CREATE TRIGGER TableUpdateTrigger
ON Categories
AFTER INSERT, UPDATE, DELETE 
AS
    IF NOT EXISTS (SELECT * FROM zzzTableUpdates WHERE TableName='Categories')
        INSERT INTO zzzTableUpdates (TableName, LastUpdate) Values ('Categories', GETDATE())
    ELSE
        UPDATE zzzTableUpdates SET LastUpdate=GETDATE() WHERE TableName='Categories'
GO