Re: two nasty schemata, union types and surrogate keys
From: paul c <toledobythesea_at_oohay.ac>
Date: Sun, 20 Sep 2009 21:04:46 GMT
Message-ID: <ONwtm.45901$PH1.29410_at_edtnps82>
Date: Sun, 20 Sep 2009 21:04:46 GMT
Message-ID: <ONwtm.45901$PH1.29410_at_edtnps82>
Sampo Syreeni wrote:
...
> The point is that a) if you cannot tell two real life entities apart
> based on their representation within the database, then b) you cannot
> tell any dependent data apart either, so that c) the representations
> within the database should actually be merged, in order to avoid data
> duplication, update anomalies and the like.
Spot on. The unmentioned context to do with identify is usually societal and often political, nothing to do with db theory IMHO. Received on Sun Sep 20 2009 - 23:04:46 CEST