请问如何在触发器中判断是触发的修改，还是删除。。

create trigger tgr_ba0
on ba2
after update, delete
as
    --修改
    if exists(select 1 from inserted) and exists(select 1 from deleted)
    begin
        insert into log(action) values('updated');
    end
    else if (exists (select 1 from inserted) and not exists (select 1 from deleted))
    begin
        insert into log(action) values('inserted');
    end
    else if (not exists (select 1 from inserted) and exists (select 1 from deleted))
    begin
        insert into log(action) values('deleted');
    end
go