> > adhoc=# update users set postaladdressid=null where id=50;
> > UPDATE 1
> >
> > adhoc=# select id,postaladdressid from users where postaladdressid=null;
> >  id | postaladdressid
> > ----+-----------------
> > (0 rows)
> >
> > Why did it not select record 50?
>
> Because NULL=NULL is not true (it's unknown).  Use IS NULL if you want to
> see if something is NULL.

If in postgresql.conf set parameter    transform_null_equals=TRUE  ????

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