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Answers and rating deltas for

how in SQL to sum up (+1) and down (-1) votes using 1 and 0 values?

Author Votes Δ
NPE 4 +0.99
Joseph Victor Zammit 2 +3.27
Albin Sunnanbo 1 -0.26
JNK 1 -0.62
Randy 1 +0.36
Andrew Barber 1 -0.46
anna -1 -3.27
Last visited: Sep 14, 2014, 5:07:29 AM