Something like this might work...

Select to_way from relation_members_way where to_way not in (select 
to_way from ways);

Romulo

Stefan de Konink wrote:
> Hi,
> 
> 
> I cannot find it back in the trackers but I think it have asked this 
> question before.
> 
> Would it be possible to output the actual failing constraint details 
> instead of 'just an error'.
> 
> sql>alter table relation_members_way add constraint relation_to_way_fkey 
> foreign key(to_way) references ways;
> !SQLException:assert:INSERT INTO: FOREIGN KEY constraint 
> 'relation_members_way.relation_to_way_fkey' violated
> 
> Inserting with INSERTS will give a nice error, because the query it self 
> contains the problem. This is not true for a copy into, or in this 
> respect just an alter table.
> 
> 
> 
> Stefan
> 
> ps. indeed I have to think too long about a query that will show me the 
> non existing primary keys.
> 
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