Re: Why relational division is so uncommon?
From: paul c <toledobythesea_at_oohay.ac>
Date: Thu, 26 Apr 2007 23:16:47 GMT
Message-ID: <zpaYh.131992$6m4.9100_at_pd7urf1no>
>
>
> Quite an interesting perspective. Although, the query "who has paid
> all their invoices
> on time?" doesn't seem to be a relational division (what relation are
> you dividing into?)
> ...
Date: Thu, 26 Apr 2007 23:16:47 GMT
Message-ID: <zpaYh.131992$6m4.9100_at_pd7urf1no>
>>I notice also that the example doesn't suggest a lot of activity, other >>than bureaucratic activity, this company might go out of business soon >>if there is no "sales" or "orders" or "inventory" relations. Lots of >>other useful queries would then arise, "who has paid all their invoices >>on time?", "which students have passed all course exams?".
>
>
> Quite an interesting perspective. Although, the query "who has paid
> all their invoices
> on time?" doesn't seem to be a relational division (what relation are
> you dividing into?)
> ...
Customers?
p Received on Fri Apr 27 2007 - 01:16:47 CEST