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How to update a row ?

Last Modified: 2012-06-21
HI i have data like this

Name         group          n1          n2    n3   n4   g1
Sathish        n1               4           5       6    7     4         according to group  g1 value will update  
kumar          n2               5           7       8     9     7
Sathish        n1              6           8        9     19   6

i want to  run some query if same user name exits then

i want get the max value that group and update in g1 .

how to get this ??

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