CREATE TRIGGER test ON Articles
FOR INSERT, UPDATE
AS
IF UPDATE(Description)
UPDATE Articles SET LastActivityDate = GETUTCDATE()

CREATE TRIGGER test ON Articles
    FOR INSERT, UPDATE
    AS
    IF UPDATE(Description)
    UPDATE a
    SET a.LastActivityDate = GETUTCDATE()
    from Articles a
    inner join inserted i
    on a.SomeIDField = i.SomeIDField