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Answers and rating deltas for

How To write query to get the output as shown below in my sql

Author Votes Δ
Jim Garrison 1 +0.25
naveen goyal 1 +3.15
Vijay Verma 0 -0.13
Prabhuram 0 -1.07
jagruti -2 -3.94
Last visited: Sep 14, 2014, 5:07:29 AM