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rociiu/gist:893688

Created March 30, 2011 01:16
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gistfile1.txt
table scores:
user_id | value | score_date
1 90 2010-03-04
1 80 2009-03-04
2 90 2009-04-05
2 70 2009-05-06
3 100 2010-04-06
Find most recent scores:
result should like:
user_id | value | score_date
1 90 2010-03-04
2 90 2009-04-05
2 70 2009-05-06
3 100 2010-04-06
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