Postgresql and oracle

Hi everybody

I'm currently wondering about using postgresql instead of oracle database
for the future web development.

I've not seen any comparision between both. Is there one somewhere ?

I would like to know if it is possible with postgresql to access data from
one database to an another (in oracle the name is db_links). The utility of
this function is to maintain only one database with all the references and
to use it on the other.

Regards

Laurent Drouet