You should be able to do this in a single update 
UPDATE Geo_postaggregated_pop_count_Ward
SET Sum_male_count =
        (SELECT SUM(G.Person_count)
           FROM Geo_postaggregated_pop_count_Ward G
          WHERE Sex = 1),
    Sum_female_count =
              (SELECT SUM(G.Person_count)
                 FROM Geo_postaggregated_pop_count_Ward G
                WHERE Sex = 2),
    Sum_of_person_count =
              (SELECT SUM(G.Person_count)
                 FROM Geo_postaggregated_pop_count_Ward G
                WHERE Sex = 1 OR
                      Sex = 2);

[download]
This assumes you can afford the large lock this would generate. Otherwise use a Transact SQL cursor.

Hope it helps
UnderMine

In reply to Re: SQL or Perl solution by UnderMine
in thread SQL or Perl solution by Win

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