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Answers and rating deltas for
Mysql concat doesn't work if a column is null, what is wrong with the query?
| Author | Votes | Δ |
|---|---|---|
| Bill Karwin | 2 | -0.05 |
| Joel Coehoorn | 2 | +0.40 |
| Toàn Nguyễn Hải | 1 | -2.81 |
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