Rank - Mailing list pgsql-sql

From Muhyiddin A.M Hayat
Subject Rank
Date
Msg-id 002001c42f80$aa192330$4f00a8c0@MIDDINKS
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List pgsql-sql
Dear All,
 
I Have below table
 
 id | site_name | point
----+-----------+-------
  1 | Site A    |    40
  2 | Site B    |    90
  3 | Site D    |    22
  4 | Site X    |    98
 
 Would like to calc that Rank for each site, and look like
 
 
 
 id | site_name | point | rank
----+-----------+-------+------
  1 | Site A    |    40 |    3
  2 | Site B    |    90 |    2
  3 | Site D    |    22 |    4
  4 | Site X    |    98 |    1
 
What can I do to get result like that

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