On 28 Feb 2019, at 4:33pm, Donald Allen <[email protected]> wrote:

> The difficulty with this is that there are fields in my database that *can* 
> legitimately be NULL under certain circumstances and not NULL in others.

Is it possible to tell from the other fields in that row whether the NULL is 
legit or not ?  You could implement a CONSTRAINT which checks a condition with 
many fields in.

Simon.
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