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last entry per person

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I have a table which holds a user name and their results in exams. There can be multiple entries per user. I am trying to return the last entry for each user. I can get the last entry in the table using the order by/limit method but how would this be applied per user. My table definition is like the following:

gradeid serial primary key,
user text,
grade char(1),
entered timestamp,
Any help would be appreciated.
Regards
Garry

begin:vcard
fn:Garry Saddington
n:Saddington;Garry
org:ScholarPack
adr:Thames street;;Histon House;Hogsthorpe;Lincolnshire;PE24 5QA;United Kingdom
email;internet:garry@xxxxxxxxxxxxxxx
title:CEO
tel;work:+44 01754 874418
url:http://scholarpack.com
version:2.1
end:vcard

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