Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: How to represent category, subcategory, product

Re: How to represent category, subcategory, product

From: Neo <neo55592_at_hotmail.com>
Date: 21 Nov 2006 13:19:13 -0800
Message-ID: <1164143952.975094.20000@f16g2000cwb.googlegroups.com> 





> > Derive subCats.

>

> You've lost me here, how can you derive subcategory from PrID, CatID?




Suppose set1 has members A, B, C.


Suppose set2 has members B, C.


Here we can derive set2 is a proper subset of set1 because
every member of set2 is in set1


but not every member of set1 is in set2.
Received on Tue Nov 21 2006 - 15:19:13 CST












Original text of this message













  HOME |
  ASK QUESTION |
  ADD INFO |
  SEARCH |
  E-MAIL US