query on two databases ..

hi,
i'am really new to postgresql and i try it with php ..

Now i have following question :

is it possible to make one query on two databases. I have a database calles
db1 and one db2 and i want to get :

select * from ":db1:table1" where ":db1:table1:col1" in (select "col1" from
":db2:table1" );

(this query will work in interbase dbs)

how is the right syntax in postgresql ??

can anybody help my .. i looked in diffent manuals but i couldnt find the
syntax ..

thanks a lot for your help in forward ..

m. Yazici
yazici(at)chss(dot)net