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Answers and rating deltas for

Can I use SQL to find missing numbers in the example table I give below?

Author Votes Δ
hova 9 +4.28
Pulsehead 2 +2.99
Tom H. 1 +0.39
Carl Manaster 0 -1.61
Paul Morgan 0 -1.44
user94967 0 -1.68
Charles Bretana 0 -0.43
araqnid 0 -2.19
Last visited: Sep 14, 2014, 5:07:29 AM