| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Usenet -> comp.databases.theory -> Re: Distributivity in Tropashko's Lattice Algebra
Marshall Spight wrote:
>
> In other words,
>
> A join (B union C) == (A join B) union (A join C)
> and
> A union (B join C) == (A union B) join (A union C)
> if and only if A and B have no attributes in common, and
> A and C have no attributes in common.
Ugh, I said that wrong. It should be
if and only if A and B have no attributes in common that
are not also in C, and
A and C have no attributes in common that are not also in B.
Marshall Received on Sun Aug 14 2005 - 02:39:02 CDT
 |
 |