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Answers and rating deltas for

How can I rewrite my query so that functions are not being called more than once?

Author Votes Δ
Aaron Bertrand 4 +0.76
Mikael Eriksson 4 +0.91
Ray 0 -0.70
Jonas Høgh 0 -0.97
Last visited: Sep 14, 2014, 5:07:29 AM