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Answers and rating deltas for

Which concept i want use to get following output using SQL server 2012

Author Votes Δ
Denis Bubnov 3 +3.88
NEER 1 +0.18
user6724826 0 -2.71
user3767858 0 -2.65
Last visited: Nov 15, 2016, 6:06:33 PM