newbie question

[Tena Sakai]

Hi,

I have two questions:
(1) I see on a page 
  http://www.macports.org/ports.php?by=category&substr=databases&page=3&pagesize=50
that postgresql90 9.0.4 and postgresql90-server 9.0.4 are available.  Would
someone please explain the difference between two?

(2) Say, I picked one of them, how do I go about installing it?  I am using
snow leopard 10.6.7.

Any pointer highly appreciated.
Thank you.

Tena
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