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
