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Answers and rating deltas for
mysql concatenate columns if column is not null
| Author | Votes | Δ |
|---|---|---|
| Spock | 1 | +0.85 |
| v2solutions.com | 1 | +1.06 |
| po_taka | 1 | +1.01 |
| Jens | 1 | +0.14 |
| Fang | 0 | -4.07 |
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