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Answers and rating deltas for

How can I optimise this query in MYSQL? What needs to be done

Author Votes Δ
DRapp 1 +1.14
Chris Wesseling 0 -1.60
grossvogel 0 -0.75
Nazariy 0 -1.45
Last visited: Sep 14, 2014, 5:07:29 AM