Re: Hierarchy as 'UP' constraint
From: mAsterdam <mAsterdam_at_vrijdag.org>
Date: Fri, 25 Nov 2005 14:05:27 +0100
Message-ID: <43870b7b$0$11072$e4fe514c_at_news.xs4all.nl>
Date: Fri, 25 Nov 2005 14:05:27 +0100
Message-ID: <43870b7b$0$11072$e4fe514c_at_news.xs4all.nl>
Oops!
I wrote:
> 'up' - rule (2) would make Y violate the 'domestic key contra int.
Should be:
> 'up' - rule (2) would make Y violate the 'domestic key' constraint.
I wrote:
> Obviously the 'ON DELETE EXPOSE' and 'ONE ROOT' constraint qualifiers
> combined make it impossible to delete the root-row if it has more
> than one subordinate row.
Should be:
> Obviously the 'ON DELETE EXPOSE' constraint qualifier and
> the 'ONE ROOT' constraint combined make it impossible to
> delete the root-row if it has more than one subordinate row.
Received on Fri Nov 25 2005 - 14:05:27 CET