select between two databases

I don't know how I can select between two databases on the same postgres-server? Does postgres support it? I have tested some ways but none of them was right:

 

SELECT s.adresscode FROM db02.adressen a,sachbearbeiter s WHERE a.adresscode=s.adresscode

Error message: Namespace "db02" does not exist

 

Error message: Namespace "db02" does not exist

 

Thanks a lot in Advance

Andreas Hitter

hmd-software AG

Munich - Germany