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Re: [Gnumed-devel] basic test types

From: Karsten Hilbert
Subject: Re: [Gnumed-devel] basic test types
Date: Wed, 29 Sep 2004 20:55:25 +0200
User-agent: Mutt/

> >> > Also is it possible that a lab may keep the same code despite
> >> > at a later date it changes coding systems?
> >>Sure. Perhaps not very likely, though. So we'd probably need
> >>the constraint unique(fk_test_org, code, coding_system) right ?
> And/or on the additional chance that a numeric code, which was used 
> under an old coding system for one test, happens to be used in a new 
> coding system  for a different test, we now have the constraint 
> unique(fk_test_org, code, coding_system) in place of 
> unique(fk_test_org, code), right?

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