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Answers and rating deltas for

How can I combine multiple records and sum the Amount row, so there is only one record after?

Author Votes Δ
NewInTheBusiness 1 +0.31
Markus Malkusch 1 -0.27
Renan Gomes 1 -0.04
Last visited: Sep 14, 2014, 5:07:29 AM