On Tue, Sep 2, 2008 at 2:35 PM, Matthew Wilson <matt@xxxxxxxxxx> wrote: > On Tue 02 Sep 2008 04:19:41 PM EDT, Scott Marlowe wrote: >> If the two subordinate tables ALWAYS have to point to the same place, >> why two tables? Can't a customer have > 1 location? I'm pretty sure >> IBM has more than one corporate office you could ship things to. > > Yeah, so the idea is one customer might have many locations and many > products. And at each location, some subset of all their products is > available. You could have the product_locations have a custid1 and custid2 fields that reference the two parent tables, and then a check constraing on product_locations that custid1=custid2
