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Answers and rating deltas for
How do I get sum of two different columns from two diffrent tables and group them
| Author | Votes | Δ |
|---|---|---|
| O. Jones | 2 | +0.77 |
| Jim Macaulay | 1 | -0.27 |
| mwafi | 1 | -0.04 |
| Pals | 0 | -3.97 |
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