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Answers and rating deltas for
How can I create a new column from two existing columns in sql
| Author | Votes | Δ |
|---|---|---|
| Cristian | 1 | +4.40 |
| Kartikeya Sharma | 0 | -0.87 |
| PSK | 0 | -0.23 |
| Fahmi | 0 | -0.21 |
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