Re: Why relational division is so uncommon?

Vadim Tropashko wrote:
....
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
.

Relevant Pages

  • Re: Why relational division is so uncommon?
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    (comp.databases.theory)
  • Re: Why relational division is so uncommon?
    ... Lots of other useful queries would then arise, ... paid all their invoices on time?", ... the query "who has paid ... doesn't seem to be a relational division (what relation are ...
    (comp.databases.theory)
  • Re: Why relational division is so uncommon?
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    (comp.databases.theory)
  • Re: Why relational division is so uncommon?
    ... Lots of other useful queries would then arise, ... paid all their invoices on time?", ... the query "who has paid ... doesn't seem to be a relational division (what relation are ...
    (comp.databases.theory)
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