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Answers and rating deltas for

How do I extract unique values from multiple columns and use them to populate one column?

Author Votes Δ
tigeravatar 2 +1.10
MBB70 0 -0.74
Ryan Wildry 0 -0.44
BruceWayne 0 -0.57
Last visited: May 11, 2019, 11:16:05 PM