Re: time/date as key fields

... normaly I would prefer to generate the Ids by my own, identity columns are looking to me like coming thru the backdoor. Writing a column to the database and looking afterwards, what I have written...

Dieter

--------------------------------------------------
From: "Richard Schoen" <richard@xxxxxxxxxxxxxxx>
Sent: Friday, November 19, 2010 3:41 PM
To: <midrange-l@xxxxxxxxxxxx>
Subject: Re: time/date as key fields

A combination of _GENUUID, Verns timestamp routine and job info would most likely guarantee uniqueness :-)

Otherwise an Identity field in the database indeed guarantees it.

Curiousity question:

How many of you are using Identity fields in databases for new applications ?

In the past we always created the base key such as Customer Number, Order Number and that was the primary key. Now I think the wisdom is to always use an identity field for primary key as well as Customer Number, Order Number, etc.... as indexes.

Would like to hear thoughts ?.....

Regards,
Richard Schoen
RJS Software Systems Inc.
Where Information Meets Innovation
Document Management, Workflow, Report Delivery, Forms and Business Intelligence
Email: richard@xxxxxxxxxxxxxxx
Web Site: http://www.rjssoftware.com
Tel: (952) 736-5800
Fax: (952) 736-5801
Toll Free: (888) RJSSOFT


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message: 9
date: Fri, 19 Nov 2010 15:07:43 +0100
from: <dieter.bender@xxxxxxxxxxxx>
subject: Re: time/date as key fields

... it depends, maybe for referential constraints, if there are database
relations.
BTW: genUUID on AS/400 is only most likely unique!!! Best choice would be an
identity column, if uniqueness is needed.

D*B


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