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Answers and rating deltas for
I need to implement below logic through one sql query
| Author | Votes | Δ |
|---|---|---|
| Gordon Linoff | 1 | +1.21 |
| Yogesh Sharma | 0 | -0.32 |
| ragini raj | 0 | -0.37 |
| MT0 | 0 | -0.80 |
| Meower68 | 0 | -0.37 |
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