On Thu, Jun 27, 2002 at 11:52:54AM +0200, J?rg Holetschek wrote:
> Hi folks,
>
> I have a problem with a CHECK clause that doesn't seem to work properly. The
> CASE
> WHEN ((focus <> NULL) AND (epilepsy_class = 'f')) THEN
> TRUE
> WHEN ((focus <> NULL) AND (epilepsy_class IN ('g',
> 'n'))) THEN FALSE
> END),
The condition "focus <> NULL" can't ever come out true. You probably
mean IS NOT NULL.
Richard
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