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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 21:41:48 +0200
User-agent: Mutt/

> further in the case where a lab might have supplied a code, but not a 
> coding system (suppose it is their own internal coding system, so 
> they do not bother naming it in their result) we might in the GnuMed 
> test_type retain the default NULL for the coding_system but that 
> would create a problem.
Why would that be a problem ? NULL = NULL is always NULL

> So we should require NOT NULL and if the lab 
> provides nothing we should assign to coding_system something to 
> reflect the source lab's arbitrariness like using the value in the 
> FK_TEST_ORG key, or else the org name, to convey "whatever unnamed 
> system Lab Org X must evidently be using to assign their code".
not a bad suggestion if we in fact have a problem with NULL

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