Hello,
can any one help me to achieve
From this
Name |Roll_Number|Marks
abc | 1 | 50
cde | 2 | 40
abc | 1 | 30
cde | 2 | 60
To this
Name |Roll_Number|Total Marks
abc | 1 | 80
cde | 2 | 100
-----------------------------------------------------------------------------------------------------
thank you.