Re: Why relational division is so uncommon?

V.J. Kumar wrote:
paul c <toledobythesea@xxxxxxxx> wrote in
RqcYh.132205$DE1.59908@pd7urf2no:">news:RqcYh.132205$DE1.59908@pd7urf2no:


V.J. Kumar wrote:


Then there is no way to determine whether or not it was paid and your
question cannot be answered in principle ! Of course, you can use
some other attribute name to reflect the invoice status, like
'status' for example.

vj



If Invoice had no "paid" attribute, I presume there would be a
Payments relation.



Whatever it is, you can easily derive 'paid' from that 'whatever' and
just go from there as if you had the 'paid' atttribute. I am not sure
what else I can add to that ...

vj

Thanks, bad example I guess, will try to think of better ones.

p
.

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