Re: Use of the term "hierarchy"

Kenneth Downs wrote:
>
> SELECT *.employee
> WHERE project_start < '2005-11-15'
>
> the the table-column-oriented system infers that you mean to pull and UNION
> the results from all tables having columns employee code and project_start?

The concern I have with this idea is that is has so much
in the way of non-local effects. One is pulling in data
from essentially the entire namespace. It's not clear to
me that one wants to have the requirement that the
namespace be fully unified; that every "employee" attribute
has to mean the same thing. Scope is a good thing.

Also a non-local effect: the creation of a new table with
the appropriately-named attributes changes the meaning
of this query. It's essentially implicitly dependent on the
entire schema. That's hard to control.


Marshall

.

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