Selecting data from a table created in another database...

I don't know if this can be done...

In MSSQL Server I can access a table created in another database (on the
same server, of course) by using the following syntaxis...

select * from databasename..tablename where condition;

Can I do this in postgres?

I'm using version 7.2 on a redhat server...

Thank you for your help...

Ligia