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Answers and rating deltas for

How can I optimize a query for selecting of the average value by groups?

Author Votes Δ
Mark 2 +4.10
baroale 1 -1.44
Dzanan Begovic 1 -1.31
Shailesh Pratapwar 1 -0.17
Last visited: Jun 25, 2018, 4:45:33 PM