>So true. I've been maintaining systems with tables without primary keys which work fine. In some cases having no primary key isn't that much of a problem.
>
>For all new systems I develop I always use a PK, for convinient reason.
>

Walter,

Show me an example of a table design without a primary key? I have seen some and it is always in a review of a system that isn't working correctly because there is no unique identifier of a record. Are you confusing the primary index with the primary key here?