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Answers and rating deltas for
What is difference between unique key with 'not null' constraint and primary key?
| Author | Votes | Δ |
|---|---|---|
| D Stanley | 2 | +0.71 |
| Andrew | 1 | -0.26 |
| jean | 1 | +0.26 |
| Glen Joseph | 0 | -3.86 |
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