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Answers and rating deltas for

I don't understand this SQL behavior for select

Author Votes Δ
mangoDrunk 2 +2.95
Mike Sherrill 'Cat Recall' 2 +0.87
Mustafakidd 0 -2.67
Albin Sunnanbo 0 -0.90
Last visited: Sep 14, 2014, 5:07:29 AM