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Answers and rating deltas for

How do I insert rows into one table from another that don't already exist in the target table?

Author Votes Δ
Sahil Bhalla 1 +4.21
Laughing Vergil 0 -0.02
SQLApostle 0 -0.97
Daniel Gimenez 0 -0.38
Last visited: Sep 19, 2018, 6:36:20 PM