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Answers and rating deltas for

How can I retrieve difference between two columns in time format?

Author Votes Δ
Serge Bogatyrev 2 +4.02
Preet Sangha 0 -0.03
yoda 0 -0.86
bkm 0 -0.72
Pavlo Svirin 0 -0.92
APC 0 -1.25
Jim 0 0.00
Last visited: Sep 14, 2014, 5:07:29 AM