How can you use a distinct on () including the whole union.

eg

select distinct on (valutaid) valutaid, short from valuta UNION select 
landid, land from land order by valutaid;

table: valuta
valutaid        valuta
1               USD
2               SEK

table: land
landid  land
1               Sweden
2               USA
3               Norway

The above would give
1       USD
1       Sweden
2       SEK
2       USA
3       Norway

What I would like to get is
1       USD
2       SEK
3       Norway

I did specify distinct on (valutaid) anyways =)

Any suggestions?

Best regards
Per-Olof Pettersson

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