>>> where a <> b or (a is null and b is not null) or (a is not null
>>> and b is null)
>>
>> In the absence of IS DISTINCT FROM, I think this has the same
>> semantics:
>>
>> where coalesce(a, b) <> coalesce(b, a)
>
> sorry, but no.
Argh, my expression is just nonsense - I was thinking of something like:
coalesce(a, 'SOME MAGIC VALUE') <> coalesce(b, 'SOME MAGIC VALUE')
and wanted to make it work for any types. Sigh.
- John D. Burger
MITRE