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Answers and rating deltas for

How do I add the values of a column togethor dependant on another column

Author Votes Δ
Marlin Pierce 2 +0.63
Vijay 1 +0.20
Piotr Wadas 1 +1.52
OlleR 0 -2.70
Prasanna 0 -2.59
Tobsey 0 -2.85
Last visited: Sep 14, 2014, 5:07:29 AM