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Answers and rating deltas for

How can I optimise this MySQL query?

Author Votes Δ
Roee Adler 5 +4.16
Welbog 2 +0.58
ttarchala 1 -0.19
mlarsen 1 -0.26
Quassnoi 0 -1.05
Last visited: Sep 14, 2014, 5:07:29 AM