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Answers and rating deltas for
create columns based on groupby elements using sql , pandas or pyspark?
| Author | Votes | Δ |
|---|---|---|
| notNull | 2 | +1.46 |
| GMB | 0 | -0.95 |
| QuickSilver | 0 | -0.06 |
| sevenmiracle | -1 | -3.50 |
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