RE: Constraints, anyone? -- MIDRANGE-L

Subject: RE: Constraints, anyone?
From: "Dennis Lovelady" <iseries@xxxxxxxxxxxx>
Date: Fri, 04 Dec 2009 19:06:34 -0500
List-archive: <http://archive.midrange.com/midrange-l>
List-help: <mailto:midrange-l-request@midrange.com?subject=help>
List-id: Midrange Systems Technical Discussion <midrange-l.midrange.com>
List-post: <mailto:midrange-l@midrange.com>
List-subscribe: <http://lists.midrange.com/mailman/listinfo/midrange-l>, <mailto:midrange-l-request@midrange.com?subject=subscribe>
List-unsubscribe: <http://lists.midrange.com/mailman/listinfo/midrange-l>, <mailto:midrange-l-request@midrange.com?subject=unsubscribe>

I've just been asked to look into adding constraints to a database (as
an alternative to triggers on the database, and exit programs on the
application).

Let's start with information about the types of constraints. What is the
business need? There are some constraints you're probably used to already
(though they go by a different name), such as UNIQUEness of a key. There
can be constraints that ensure that data is not orphaned (such as an order
record without a matching customer record) and so on. What type are we
talking about here?

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"The problem with being punctual is that nobody's there to appreciate it."
-- Franklin P. Jones

As an Amazon Associate we earn from qualifying purchases.

Follow-Ups:

ARE: Constraints, anyone? , David FOXWELL

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.