2009/8/6 Jeff Davis <pgsql@xxxxxxxxxxx>: > On Thu, 2009-08-06 at 13:15 -0400, Merlin Moncure wrote: >> in 8.4 you can (and should) do: >> WHERE old = new > > I couldn't get that to work in a rule. > >> IF NEW != OLD THEN -- 8.4 syntax > > Does this work correctly in the case of NULLs? It looks like it does, > but that seems strange, because ROW(1, NULL) = ROW(1, NULL) evaluates to > NULL. Where is this documented? > it's not safe, I thing so correct test is IF NEW IS NOT DISTINCT FROM OLD THEN ... regards Pavel Stehule > Regards, > Jeff Davis > > > -- > Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
