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Answers and rating deltas for

How to I construct this type of SQL statement

Author Votes Δ
Holger Brandt 2 +3.21
raina77ow 2 +1.03
Alex 1 -0.73
dweeves 1 -0.27
Dojo 0 -3.36
Last visited: Sep 14, 2014, 5:07:29 AM