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Answers and rating deltas for

Can anyone explain me about this SQL Query

Author Votes Δ
shahkalpesh 10 +1.01
Anders Abel 5 +2.34
Guffa 3 -0.48
Abtin Forouzandeh 3 +0.14
Ashish Yadav 1 -3.21
neverend 1 -3.21
Last visited: Sep 14, 2014, 5:07:29 AM