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Answers and rating deltas for
How can I ensure that Column_A can only have a value if Column_B is NULL? And vice versa
| Author | Votes | Δ |
|---|---|---|
| Gordon Linoff | 2 | +0.19 |
| a_horse_with_no_name | 2 | -0.65 |
| The Impaler | 2 | +0.46 |
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