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Answers and rating deltas for
Need Sql Query to generate output as shown below tables
| Author | Votes | Δ |
|---|---|---|
| GarethD | 1 | +0.29 |
| Venkatesh Panabaka | 0 | -0.39 |
| Beniamin | 0 | -0.58 |
| Venu koushik | 0 | -0.73 |
| Yosra Nagati | 0 | -0.64 |
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