> the questions are about CREATING DB
>
> I found that FOREIGN KEY clause, which we need for our DB, is not >
implemented on PostgreSQL.
I believe, it's implemented called REFERENCES
http://www.postgresql.org/devel-corner/docs/postgres/sql-createtable.html
> that means you can't use DELETE CASCADE clause neither.
This one I am not sure, but seems can be implemented by adding one
trigger
http://www.postgresql.org/devel-corner/docs/postgres/sql-createtrigger.html
Have fun
--
LM Liu